Yeah investing on betting site, you will get some profit in a long term but it really depends on your funds to when you will get huge profit or not.
It doesnt matter if you have a huge invesment or not because you will get profit or even lose your invesment according to the percentage that you invest in. If you suppport 1% investment bankroll then you will get either 1% profit or 1% lose so it depends on the bankroll itself