96 on Amazon</a>. The game's developers, Harmonix, are worth a similar amount of dough according to a report on All Things Digital. The site details that Harmonix's independence cost investment group Columbus just $49.99.

Of course, it all gets a bit complicated from there on. Harmonix's new owners assume liability including "music rights fees ... responsibility for lots of unsold games and equipment sitting on warehouse shelves". The net result is Harmonix's previous owners, MTV Games, scooping $150 million in tax benefits.

Business. There's more through here.