Is there a way to see how much gambling sites makes?
Most of the site's now shows how much they won or how much they are in profit. So what you have to do is just go on that site and see site's profit. Case solved.
And do you think they will display their actual l statistics of their revenue for all to see? I beg to differ, it is no public ledger and what you see might be contrary to what's actually happening down their chamber.