The chances of getting banned are not high at all. I can go for at least a month on DEX, with apps like Webman, Multiman, etc. I don't really open apps like multiman much, but loading games from webman does not get me banned. I think if Sony scans your PS3, than you will be banned. You just gotta make sure not to get banned on games, because if you're banned for cheating, Sony will scan your ps3 to check for modified firmware or files.