I did the same thing with the Golden Palace bonus and was able to cash. I just need to send them my ID's and I'll have a $300 profit ($100 deposit + $300 sticky, won my first bet to get to $800 and then lost $100 finishing up my wagering requirements). There are other casino's in the same group as Golden Palace that include Aspinall's, Grand Online, Flamingo Club, and 24kt Gold. These casinos only have a 200% deposit bonus though.

I have only done Grand Online from that group and tried it the same way, but lost my initial bet. Hope this helps.