I am also going to tag LoyceV in this post. I like the way he thinks and how he analyzed some other situations in the past involving scams and abuses. @LoyceV, whenever you get a chance...
I'll read the topic. And I've posted in
Rollbit's topic to respond here.
Obviously, I saw an opportunity there to gamble with bigger amounts even if I do get limited.
Did you use multiple accounts to bet more than the limit on a certain bet?
Again, I'm not denying multi-accounting at all. But as I said before, nothing in their ToC is stating that it's not allowed to create new accounts or "abuse" their sportsbook (which I haven't).

Any chance Rollbit can explain what action of yours was nefarious?
1 hour later he messaged me over the support with the following sarcastic message:
This doesn't make sense. If you abused sportsbook, they should provide evidence. And if they appreciate you depositing back the allegedly stolen funds, it doesn't make sense asking not to open more accounts so they can further "recoup losses".
I created another account and deposited 10.000$ in bitcoin (which for me is a big amount).
For the record: betting with money that you consider a big amount is probably not the best way to spend your money.
Using multiple accounts to undo set betting limitations can be a reason for termination because of "Any reason whatsoever".
And when that happened, you lost your right to continue using their service ("Your right to use the Service will cease immediately"). That can mean any actions such as depositing, wagering, withdrawing, etc.
Terms that state they can do whatever they want "for any reason" are unfair. "The user deposited $10k (or $1 million)" would also be "any reason", but doesn't justify they take your money.
@OP: this story sounds familiar: did you use another Bitcointalk account before this one?