Hi Curly, welcome to the forum! 
I only know of one casino (group) that has this rule in their bonus T&Cs.
You seem to be surprised by their decision, that leads me to think you didn't read the rules or terms of the bonus before claiming it.
For every bonus (at any casino) there are rules you have to adhere to, to be able to cash out any winnings.
There may be limits as to what games you're allowed to play, or how much you can bet on each spin (or hand).
It seems you have broken the latter. Most casinos would confiscate your winnings for "breaking the rules", but the casino in question has taken a different approach. They are still prepared to give you a chance of cashing out, by wagering winnings from rounds in breach of the "contract", a 100 times.
For details on your case, you could try contacting the forum representative of the casino. They should be on this list:
http://www.casinomeister.com/forums/showroster.php
Freddy
Life's a binge and then you diet
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