PSP Go. A few game developers are voicing concerns about the amount the ESRB charges (we're hearing around $2,500) in order for their titles to receive a rating, particularly when those very same titles don't have such a costly requirement in Apple's App Store. Subatomic Studios, for instance, can charge $2.99 for the iPhone version of Fieldrunners, while the same game is priced at $6.99 on the PlayStation Store. Naturally, the ESRB would love to get in on App Store ratings, but it's hard to say just how long (if ever) that cracking process will take. So, any of you devs put off by the ESRB fee? Put off enough to sidestep PSP Go development altogether?