Ahhh, darn spammers! Making life harder for everyone :-/ But I do understand the need for such precautions like the post limit and browsing time -- having administered forums myself, trust me they come from all sides like locusts! The scary bit is that a lot of those are not even bots posting but actual people, even sometimes patient enough to go through a few "clean" posts just to fill the forum with crap the second they're free.
Oh well, a few more minutes and I'm done. It's actually refreshing to spend a little time getting to know the new members... See all around!