No one can stop them. There's nowhere to hide. All you have to do is leave the new release shelf and look for them.
Obscurity is a relative thing.
A movie might be obscure because either nobody promoted it or it got lost in the shuffle, or it's obscure because it sucks. Most times, it's the latter. The funny thing about it is that one can find pleasure in such crappy movies, as much as good ones. It's the bit of masochism that lies in all of us. Just because a picture is low rent doesn't mean it has to be low-watt.