Any ideas how profitable a review site can be?
I am sorry to point out that you have failed in the very first step you have taken. The purpose of an ICO review site ought to be honest presentation of facts; which is undermined by the pursuit of profitability. Several ICO review sites that started well degenerated into paid shills all because of their worship at the altar of profitability.
Forget about profits; just try to keep a clean slate. Eventually, You will be well rewarded for your honest endeavours.
Hope this chord has struck home. We need honest players in Cryptocurrency.