I won't answer as I'm assuming your thread title question is a rhetorical question, as it wasn't punctuated with a question mark
Try to remember that there is a difference between knowledge and intelligence. People who are sufficiently ignorant might appear to be stupid, but unless you give them a few IQ tests you won't know if they're stupid or not. Please try not to misinterpret ignorance, for lack of intelligence, or for that matter, a lot of knowledge, for a lot of intelligence.
It might be frustrating for those of us who know a fair bit about computers, when people who know very little, use them in a way which appears stupid. However, most of the time, if properly educated and informed, the majority of seemingly "stupid" PC users would take the correct course of action and make the correct decisions when faced with computer related problems.
I strongly dislike intellectual laziness, but I also dislike intellectual elitism. If we start to collectively develop a supercilious mindset towards those people in society who do not know as much as us, or who are genuinely less intelligent than us, we risk becoming intellectual bigots and creating an ethos of intellectual supremacy within our own social group/s.
I've got no problems with venting a little frustration, but a little balance is needed if we're to try and maintain an objective perspective on this kind of thing.
I've been self-employed for over a year now and I know how tough it is; especially when you have to deal with awkward customers. Just make sure your customers know your basic policies up front and make sure you have insurance that covers legal costs. Getting sued can easily destroy a small business, not only financially, but also reputation wise.
There are many "pros" to being your own boss. There are also many, many "cons" as well and much more risk. Running a small business is not necessarily an easy way to make a living, especially at the beginning. Advertising is important and the most powerful form of it is personal recommendation. If you always strive to provide the best possible service and product possible, your reputation will serve as the best advertising you'll ever have. What's more, it's free!
I Hope everything works out for you iamme. It's hard work, but if you can pull it off, it can be worth it