Thats why you do your research and any reputable board wont let scumbags advertise. When there is a problem, and it does happen time to time usually one of the other labs steps up and makes things right for the person that got screwed over. When you click on a ugl thread there will always be reviews from customers. Just be smart and look for vets and mods that have written good reviews. If you see a lab and it has a bunch of good reviews from people with a few dozen posts or less then I would move on. This place used to have some awesome sources back in the day.
I would rather trust a source on a board than the guy from the gym for getting my gear. Plus when you go direct the prices are super cheap.