I guess it depends in you and your investment site but if its trading its absolutely okay trading only profit. But when you save your money your money will stack and no more income except you have a job. 
yet my answer is invest it.
Investing doesn't necessarily have to be investing in a particular site. It can also be investing in real estate, stocks... In fact I think investing in real estate only is far more popular and well known rather than investing in sites. Alot of those sites are scams. yet my answer is invest it. Yes and when we talk about an investment its never limited to online world as there are many better places in real world where you can invest your money and can get good returns and if your plan is to invest your money then better choice would be to invest in real world instead of taking risk of investing on online sites as the it holds negative impression in the minds of people.