Hi, you might try investing in casino bankrolls (see results of my own investments in my signature).
It's long term investment but unlike ICOs you can withdraw your funds anytime (and invest them elsewhere).
Is it an investment or what your trying to say is try gambling on the site?
It is an investment. I'm trying to say that you can lend your BTC to casino (so they can attract bigger players and make a bigger profits). It's like any other business. Bigger capital brings bigger profits.
FYI: max. possible amount player can win is given by amount of funds casino have (bankroll). To prevent bankrupcy the players can win only small fraction of the bankroll (otherwise some superlucky gambler could ruin them in one game).
You lend your BTC to casino. Now the casino can offer bigger max. win amount and attract more wealthy gamblers (which is obvously their aim).
As a reward the casino will share with you part of their profit.