Well, I assume that asking for investments for a website without proving your concept first isn't really going to give you much since I guess not that many people will be willing to take that risk. Maybe you should start by funding the website yourself at first for a small period. Besides that, each type of investment has it's own advantages.
For a crowd funded bankroll you'd probably have to deal with the funds of hundreds of investors and probably handle bigger amounts. But on the other hand a bigger bankroll would allow bigger bet limits and therefore attract bigger bettors.
Privately funded websites give you better flexibility when handling funds, but finding a small group of people willing to put large investments on a newly created website could be hard.
I want more feedback on who would invest and how much. I can explain the idea to them. I want the bankroll in well before launch (obviously) and I can't fund a whole bankroll myself without having tiny limits.
I am interested in doing it privately, but I want to know what everyone thinks before I do so, and I want to know if anybody would be interested in investing.