Was planing to invest on a gambling site since they said its a gauranteed profit since the house can't lose but I'm still skeptical about it, i don't have much BTC so I have to make sure whether its going to be profitable for me. What possibilities could happen to the gambling site i wanted to invest into and how am i going to lose my investment in such a manner?
There is guarantees to have profit on long term when investing, because the casino always make profit on long term, if they wouldn't, the casino would crash and nobody would like to be a casino owner/operator. Invest in gambling sites is different from gambling in gambling sites.
The risk is still there, so investing in a gambling site might not profitable at all. Perhaps your goal should be long term so see if you have really profited but if you don't have much BTC and you are not for the long run then investing it in will not be a good idea for you. Maybe you can go for trading and not investing.
The one reason of people losing their investment is because of variance, meaning that the gambler could make a lot of profit in the short term, causing the site and investors to lose a large amount of their investment and even all of it.
Crypto-Games for example, has proper bankroll management, meaning that they limit the max win amount one can make with 1 bet.
So chances of you losing your entire investments are slim to none.