Yesterday I withdraw 3 times. 3, 5 and 5 BTC. Each withdrawal is processed in just a few seconds.
But I don't know today why it is taking so long to process. More than 6 hours now. But I will still wait before making a deposit again.
Sportsbet is absolutely legit and will not scam you... Have you contacted their support? Alternatively, you can also get in touch with Steve by sending him a PM here on bitcointalk.org -->
https://bitcointalk.org/index.php?action=profile;u=832366