This is heavy - 60$ is far too much for an Arcade-Hack, I guess John just waited for a chance that there is no use of his old v3arcade-Hack, and this chance came up with vBulletin 3.5.0
He might have thought to have the only Arcade-Hack then so most users had no chance to avoid buying/licensing his new Arcade-Hack, that's the reason for that high price...
But be sure - i a few days after releasing the new ibProArcade he surely has to fight for each customer and give god reasons for paying 60$ while this (better?) ibProArcade is for free
Of course everybody should feel free to make his own decision which is the right Arcade-Hack for your personal interests, just make sure to give the new ibProArcade the chance it deserves