There are a number of people that I would absolutely trust to buy possible hets from. And there are, of course, people that I would NOT trust to buy possible hets from...but I also wouldn't bother buying anything else from them, either.

I understand that there are some folks in the world who simply can't trust ANYbody...for whatever reasons that may be. If you're that sort...then buying possible hets probably isn't a good idea for you.