I agree with Greedygirl on every point except “affiliate advertising will not be enough to keep you going”.
If an affiliate program is run successfully, working closely with the right partners/websites and not accepting every man and his dog as affiliates, and targeting the right market, and with COMPETENT support and staff, I believe affiliate advertising can be more than enough to make a casino successful.
But like I said, I agree with every other point – especially the last one.