Probably does happen a lot, but that's a bit harsh for those with a genuine question (as in not connected to the vendor)
The recommended vendors section is a good place to start, but it is far from comprehensive. I myself trust several vendors that are not on that list, and if I needed to ask the question. Has anyone ordered from.......? I wouldn't hesitate to do so. I would of coarse check the list, and do a forum search first, in case the question had already been asked.
Disclaimer:
I am loosely connected to a vendor (just the 1) that is not on the afore mentioned list. The name of who will not be divulged in this thread, that's hypocritical.