There are not too many PPV events. UFC 108 was glaring proof of this.
A bazzilion injuries and still it was a very entertaining event even though there were few big name fighters.
The fact of the matter is that when there aren't a bunch of top name fighters in the UFC then there are some good up and comers which was the case with 108. Dos Santos, Jim Miller, Lauzon brothers, Hazelett, Daley and then Silva and Evans.
I fully understand why some people would think that this event wasn't worth purchasing but that is a personal preference and it is only really due to some amazing cards that we have seen.
The UFC didn't plan on this card to be the way it was, they planned on a few big fights, injuries got in the way and the UFC still pulled through and put on a great show. A couple less injuries and this event could have pulled in 600,000+ buys.