This showed a total lack of respect for fans as numerous scalpers gobbled up the tickets and are now selling them on eBay for ridiculous amounts of money.
It's just another example of how true fans get weaselled out of tickets. Dana White, the UFC president, should have capped the pre-sales. After all, those fans who have long supported the UFC deserved the chance at tickets, not the scalpers.
The UFC probably didn't expect this sort of response when the tickets went on sale. They'll likely adjust their policy from here on out.