Its never going to be possible. PrimeDice is one of the most succesfull dice site around and everyone would love to have a share of PrimeDice. Stunna and his private group manage to secure this site and fund the bankroll in the past, I doubt that they would want to let another people to put in some investment and share the profit of it
I doubt Stunna will agree, Basically why would he want to share this site's profit to stranger while he can fund the site by himself and his private group though. Logic isnt it
The main reason we didn't take crowd funded investments were due to legality (SEC regs etc). But there's also other concerns. For example, another hufflepuff type scenario[I'll publish the post this week], and also the lack of provable fairness for investors. Ultimately it would be a significantly greater amount of stress with no major benefit for the bettor since we have sufficient bankroll to raise our maxbet beyond the competition if we wish to do so.
I can see certain benefits though, I'm sure volume would increase significantly and the community would grow as well. We might do it eventually, but at this moment we're not ready for the responsibility. Right now our focus is on building the greatest online casino of all time and maintaining/improving primedice.