I'm a BTC novice myself, but they're one of the more popular and reputable ones. I'm sure there are ones out there with lower fees. When depositing and withdrawing from a sportsbook, you need to also get an intermediary wallet such as block chain.
Places like coinbase and circle will close your account if you are going straight from them to the book and back with no intermediary wallet
This forum has lots of good info regarding bitcoin. Poster "Raiders" is particularly knowledgeable
www.sportsbookreview.com/.../sportsbooks-industry