They probably don't cost as much as the bigger arenas but they sell as many tickets if not more with pretty much the same pricing.
I dont know if the prices are the same. Their ontheroad-PPVs apepar to be $35-$60 for the floorseats, and the rest of the arena are $10 seats (which is usually 60-70% of the arena). I'm not entirely sure, but i think they used to have prices inbetween the $10 and $35 range. But either way, $10 is a perfect price for a company that has to grow a fanbase, especially compared to WWE's overpriced tickets (at least $25 minium for a crappy seat at a B-ppv).