That stuff takes time. They have to check the game again to make sure it doesn't have an exploit for people to hack the Vita with, and if it does they temporarily take it off the store to re-add it with any exploits gone. And really, the real support for Vita comes from the games that are actually released for them and not compatibility games for PSP and PSone. Plus RPGs are successful on PSP so of course they'd release more. And given that there isn't a lot of games that you like up there (I assume shooters?) doesn't mean that it deserves to be hacked.
Let's say you ran a store, and a consumer who invested in your store doesn't like it because you don't pack the complete variety of dog toothpaste available, so what you're saying is you should abandon the store and let him do a hostile take-over? Your logic is flawed.