I told him that his system isn't worth over $2000 because he is looking to trade my Asus G73JH-A1 with OCZ vertex 2 60GB plus cash on my part. I also mentions that his case isn't really expensive and his system is "used", not brand new.
To start off with, you English not good. If you are going to reply to an ad, be it on craigslist, or any other, it would greatly help if you used English in such a way that it can be understood better. Also, just because you don't like an ad, or agree with what it says, doesn't give you the right to flag it, and cause it to be deleted. Based on the time of your e-mail, and the time that the ad was deleted, there is, at least, a 95% chance that you are the cause of my ad being deleted. It would be greatly appreciated, by myself, as well as others, that, if you don't like an ad, or what is contained within that ad, you just leave it alone, and move on.
As with the rest of your e-mail, I can state the following:
1) Just because you are a member of multiple forums doesn't mean you know everything you think, or want to believe, you know. Anyone can joint the forums you mentioned, as well as any other such forum. I, on the other hand, am on the Microsoft's Developer's List, as well as a member of their "Family & Friends" list, and have been involved in testing multiple products for them, some done in-home, with others done at their Mountain View campus.
2) I know exactly how much Micro Center sells the Core i7-930, and, having purchased from them many times (most of the staff in the components department know me, as does two of the managers), I also know that the Core i7-860/870 costs more than the i7-930. You have to remember that, while the i7-930 is the bottom-of-the-line (meaning the slowest CPU, and least powerful) of the 900-series, the 860/870 is among the top-of-the-line (ie. the fastest, and most powerful) of the 800-series, not to mention being one of the three most powerful CPUs of the entire Socket 1156 collection of CPUs. While the 930 and 860 share the same core clock speed, when it comes to Intel's Turbo Boost, the 860 auto-clocks to a higher speed than the 930. Not only that, but, when it comes to manually overclocking these two CPUs, the 860 can be overclocked far greater than the 870 (if you check, you will see that the 860 holds the record for overclocking to the highest speed, that being 7.3GHz, although, even when done by your typical hard-core gamer, it can still be overclocked far greater than the 930. I have seen multiple people able to OC their 860 to speeds in excess of 4GHz, with some reaching as high as 4.33GHz. On the other hand, the fastest stable speed the 930 can typically be OCed to is 4GHz, and just barely.
3) As to your GPU, the inclusion of the words "reference design", and "OC" shows that you don't even know what they mean. To put it as simple as possible, they are contradictory to each other (in other words, that means they have entirely different meanings, such as 2-wheel drive, and 4-wheel drive). There is NO such thing as "reference design OC". Any GPU that is OCed has been OCed by the manufacturer of the graphics card, not ATI/nVidia. As for the price you stated on the HD5870, if you purchased an OC version for only $310, then you must have gotten a deal no mere mortal has been able to obtain, for the OCed 5870s at Microcenter sell for $440-450, and even higher at TigerDirect (as a true builder, I also have a business account with them). Even if you bought a stock speed "cheapie", as in, a very low-quality, graphics card, such as one from Visiontek, Galaxy, Sapphire, and several others, the lowest price one can be found is $350, and that's only AFTER a $20 mail-in rebate, meaning that the real price of it is $370.
4) I see that the only two components you dared to mention are your CPU and graphics card, which doesn't say a lot for you computer. If you are (supposedly) able to build a better/faster system than what I have (or, should I say "had", thanks to you causing my ad to be deleted) listed on craigslist, then why don't you provide me with the specs…ALL the specs…of this system of yours, and let me do a real price comparison. Of course, this is only if you truly believe your computer to be better, which I highly doubt will be the case.
From everything I have mentioned above, it seem quite…actually, extremely…obvious that you don't "know your stuff" as much as you think you do, or try to convince yourself to believe is true. Before you tell someone their "system doesn't worth", or, to use PROPER English, "isn't worth", $2000, try checking out the prices. Then, once you have the prices of the individual components, add in the costs associated with building such a system. Not everyone knows how to build their own computer, and that includes a god number of gamers, who still have their systems built by someone else. Once you add in the build cost (which, in the case of my computer, could easily be $200-300, and, if you don't believe me, check with some other people who really DO know what they are doing, as all the extra touches I did cost more than just a "basic" build, which mine, most definitely, is not), then you also need to add in the cost of the customized, and custom-painted case, which, as I mentioned, would cost, at minimum, $350-500. If you check around, you will find some computer case painters who charge as much as $700, and that's just to paint the case a solid (as in, only one) color. My case consists of a 4-color design, with the "HAF 922" logo having taken considerable work and effort.
Once you figure out these things, as well as being willing to e-mail me the specs of this computer you claim to have built, then we can compare the two systems against one another, mono e mono. Until then, and even after then, try not to flag ads just because you don't like, or don't agree with, them.