Excerpt from the GIA Player Ethics Page
4: Important - It is our viewpoint that a casino that offers a bonus must honour a payout to a player who plays according to the bonus terms and conditions.
5: Important - If a casino chooses to offer bonuses as a marketing tool then it is our viewpoint that they have knowingly given away the whole or part of their house edge for whatever purpose, be it marketing or simply generating goodwill. We reiterate though, that we know that conditions are attached to bonus play and only ask that you make those conditions known to us, the players, in a clear and concise way that is easy to find as well.
6: Important - We reject the old argument that bonuses are being abused if a player makes a minumum deposit and takes advantage of the bonus. You (the casino), chose to make a bonus available and stipulated measurable terms and conditions. If we, as players, then go on to win within those terms and conditions, then it is our right to be paid as well. Again, we emphasise the fact that YOU chose to offer the bonus and YOU set the specific provisions. If we win, and if you deem us to be undesirable as players, then please pay us out our winnings and ask us to leave. We acknowledge that it is your right to do so.