tl;dr Making MP apps is better than running a standalone investment site, so make moar apps!

Really, why do you think so? Under the assumption that you want investors in your casino (either you can't BR yourself or you don't want to due to the risk) I always come to the conclusion that it is better to create a MP app than to your run a standalone casino with investments.

Historically (thanks @NLNico) the overall average edge of MP has been 0.9351% and app owners got an 0.5128% edge which translated to 54.84% of the expected profits. That is higher than for example the 50% of expected profits that Pocket Rockets Casino [Ref, NonRef] takes, the bitcoin dice site with the highest commission that I know of. In my opinion, it is safe to assume that you won't get a lot of investments if you start your standalone site with 54% commission and furthermore you miss the opportunity to source MP's userbase. Consequently, I think that it is better to run an MP app instead of a standalone investment site and that would also be the case if the app commission was lower.