With that said, you can actually be part of their bankroll by investing. Another one, is you are secured that bustadice has their funds covered by the owner and it is very highly likely that they will never run out of funds.
I think it is fewer here in the forum gambling sites dice that allow investing investors to put investment in the bankroll. I think they have a high ROI from your investment. That is the advantage of eldest gambling sites, they already build trust from their costumer while a newly launched will need to prove their selves just to be trusted soon. In the gambling industry, there's a lot of competitors and I think they are doing their best now.
Yes, if you will look upon most of the casinos existing here, you can count on how many of them are offering investing to their bankroll. But high ROI, I don't think so, investing in bankroll for example in bustadice won't grow your money as quick as you are thinking.
This is a long term investment and commitment that you had to agree. Competitions are everywhere and obviously with the number of casinos that has different games and others that are focused solely with dice has also its competition but bustadice remains humble being part of the top dice sites.
Since the bustadice bankroll is massive, most investors will only get a small stake in the bankroll if they invest, and thus their ROI won't be insane. But, it's a worthy trade off, since they get top notch security and accountability from two of the most trusted names in the space. 100% worth it and the best option for investing imo.