Is that 600 dollars on top of the license cost? And is that for all time even when upgrading to future versions? For the right situation, that's not a bad price at all.
From what the emai said that I got back from vbulletin.com that $600 DOES NOT include the license fee BUT it does go for all your vbulletin forums. In other words if you have a license for 10 vbulletins then if you pay the $600 you can take the copyright off all 10 of the boards.