My observation with the dildo wall at some sex shops I've been to is that there is a greater variety and quantity of smaller thinner dildoes and vibrators than there are of thick and large 8" plus ones.

If the market for dildoes speaks then it kinda makes you wonder what's really comfortable and pleasurable for a woman. And if the size thing is a male ego phenomena - it's what men think women really want because it's a virility contest among guys. When in all actuality women actually prefer to insert average or smaller cuz it's just more pleasurable.