AFAIK Bustadice and Bitvest are two reputable casinos in this forum that still offer bankroll investment, so if you really want to invest you can choose those casinos. Although it sound investing in casinos are very profitable since the house always win, but they have a rules about withdraw fees where you want to withdraw your money from the bankroll investment. It depends on each casinos, just like Bustadice who ask 2% of the total investment.
If you didn't hold for long and withdraw your investment before it reach at least 2% profit, you'll loss.
Oh, yes, thanks for mentioning these ones, although I haven't heard positive feedbacks from the profitability point of view about these casinos. If I remember correctly someone who invested in Bitvest had his investment pretty negative (in LTC currency I think), while Bustadice didn't show expressive results too. To make this kind of investment worth I believe the casino has to be very active and popular, otherwise it will be a risky deal, since few gamblers can come in, win a big prize, go away and there won't be many customers/gamblers to cover the loss the casino and investors had. Then you might have your money stuck there for a long time just to recover the same amount your deposited initially.
And as you said, there is also this cashout fee rule which discourages the investment a little more...
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The strengths of the casino may also be its weakness, too.
If 100 players won a fair amount in a day, it can greatly affect the bankroll of the casino and even one's bankroll investment. IMO investing in casino bankroll is tricky and more dangerous than investing directly in the platform and helping it develop its infrastructures. The return is lower on the latter but it ensures that you'll have profits over time compared to just investing on a bankroll wherein a good day for someone is a bad day for you.