Does the license includes support when customized?
If you own BTC/Altcoin casino, it does not mean you can make fast profit. Yes, some BTC Dices sites make a lot of BTC as profit, but it is not so easy task - you must have fast download time, active and wide spread advertising, cool faucet etc.
Not an easy task indeed. It will involve a lot of marketing so an investor would have to pull out more than 20BTC for the casino site to be known.
And maintaining the users to have the thrill to make them stay on the site is another stage.
Partnering with someone before buying might be good option and then let users also invest to the site.