I know a couple of guys who posted their stuff here. They don't care about the complainers because the complainers don't have and don't offer to have skin in the game. They did the sensible thing, which is to be polite and respond noncommittally thanking them for the feedback or to ignore them.

Because you don't get information that will improve the product from them, they aren't potential customers, and they usually don't know what they're talking about anyway.