I think with sites like 5Dimes and Heritage if you put bitcoin in you have to take bitcoin out although I could be wrong. I know Heritage charges around $50 for a check withdrawal and it looks like bitcoin is free.
This is why I prefer the method of Bank account -> Circle -> Nitrogen Sports and back the other way for withdrawals. Each transfer in and out of the sportsbooks takes literally seconds. I think people would be amazed how fast it is. Even faster then 10+ years ago in the golden age with Netteller. Best of all I keep my balance at the books low and transfer in only what I need to place a bet. No more keeping $1,000's at a book wondering if the feds are going to sieze it all (Full tilt, Poker Stars, Legends Sportsbook, etc.)
I understand that is the common consensus as there is no 1-800-BITCOIN number to call is something goes wrong. It's defiantly an exercise in personal responsibility and at this point in the game is not for everyone, one day down the road it will be. If you are scared of someone stealing bitcoin you should know that using strong passwords with 2 factor authentication is generally more then enough to secure your stash.
Once you start getting into the 1000's and life altering amounts you have to change the way you approach bitcoin. You don't keep all your bitcoin with one address, use things like cold storage for most of it and a "hot wallet" for your weekly expenses. On services like Circle.com you can set withdrawal limits which I have set at $50. This way anytime I want to transfer out more then $50 Circle sends me a text code that I have to input for the transaction to proceed. Unless someone has your cellphone and a gun to your head it's fairly unlikely anyone will be able to drain your account.