The problem is, the bad pump issue is a hit or miss issue.
Some people are experiencing problems. But some people aren't.
You also have to take in account that the specs of the pump are up to 45dBs, anything after that. Then it is taken into consideration for replacement.
You have to also take into an account that the people who're buying this kit are new to WC'ing and there for don't really know how to properly get rid of bubbles etc. Some of these issues might be causes by user error, and not by XSPC themselves.
I am fortunate enough to have a good pump, I know there have been some users in the past that have had bad pumps. I would much rather people post in here that they are having a pump issue so we can help troubleshoot them, rather than them go storm off to XSPC on a whim. I'd rather this thread be the last resort before having them go to XSPC with their issue. Some people have had the issue of noisy pumps but only to be fixed by the users in here, whither it be bubbles in the loop or case vibration.