I think this would be a good idea only if it contained universally usable accessories or toy accompaniments... Wipes, bullet vibes, lubes, cleaners, covers... Small samples of bath, body and sensual stuff. That sort of thing.
Example, one grab bag could contain a bottle of toy cleaner, several lube sample packets, some Eden wipes, a small container of bath salts and a feather tickler.
If there were grab bags of toys themselves, I wouldn't be as interested because I only like a few materials and a lot of toys don't interest me. I don't have anyone I can give them away to, so it would be wasteful for me.