Perhaps the fact that there were way more downloads of the binary than source requests set off some red flags in the system?
Yes, but I still think that the number of binary installs is higher than the number of source downloads.I think the number of people that compiles things from source on linux is much higher than the people that get PRO from source, especially since it's not like compiling with different instruction sets or whatever even makes sense on the PSP.
Hell, look at Gentoo, it's pretty much "from source or you're a big pussy".