It works for mame because you have a history.dat for mame/arcade. There is no history.dat for consoles that I am aware of.
The scraper I believe just finds artwork and such. That can be downloaded, stored locally and used without a scraper. However it is a lot more convenient!
You can also back what the scraper brings down so that don't have to re-download it...much faster!
Emulation Station will grab game information with its scraper but it is nowhere as complete as mame's history.dat. Pay will work on that I am sure..after the "more important things" are finished with attract mode.