Having enough funds shouldn't be the only thing to focus on. Putting up a casino isn't an easy thing. It would require your skills and knowledge of this business and be honest, establishing a reputable casino will be hard if you can't meet the standards of most players. You have to make sure that you're also able to meet all the requirements needed to run a casino and where to get trusted people who could help you run this business successfully. You could risk a huge capital but you might lose it if you are not knowledgeable enough about what you are doing.
Some of those standards of most of the players you are saying required some money too. The market of online casinos are pretty tight right now and if you don't have any money to fund the promotion, You are easily at a disadvantage against other casino which literally spend a hundred of thousand just to maintain their loyal gamblers. Skills, Knowledge, experience, money and trusted partners are just some of the few needed factors that a casino owner should have. Missing some of it will put you in a dire situation where it would be hard for the owner to set up a reputable casino. Every thing has a process and being a reputable casino requires a long process along with the factors I have just mentioned.