It varies, your user base HAS TO CLICK AD's for you to get paid... here not so many click so we don't do so well, we're lucky to pull $100/mo (which is the minimum monthly payout); some sites however make thousands per month (a friend of mine's site pulls 6k/mo for advertising).

it really varies, especially if you have the content to keep your users happy...

In the start, you won't make a thing, that's a promise... you need content, users, something to bring users back, etc...
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