Some very big brands and reputable stores sell SARMs... and we can come on here and discuss them openly. Buying pharma-grade meds etc. is a different story. We can't source, so have to look elsewhere to try and find out whether a prospective retailer / product is decent.
A google search is ok, but if the recommendations are coming from a forum / people you don't know or trust, then it doesn't make you feel better about ordering. I'd imagine there's a mental leap involved from going from ordering a SARM by a known brand, to buying black-market pharmaceuticals. Wasn't an issue I had a problem with, but I can see why some people might.
Personally, I'd prefer to see the block on sourcing for SERMs etc. removed, for the benefit of everyone's balls.