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I will rent your Facebook account for 15 days & pay you $50 through bitcoin or Paypal whichever you prefer....
I do not understand why you need to rent an account for advertising, if you can just pay for advertising and it will be placed by the account owner. This will reduce the risk of account blocking. Or is there the whole problem in the subject of advertising that you want to place?
When you run FB ads, you can run it and spend a small amount of money. Then you can run ads without money, FB will charge later.
For example, he rent foreign account for $50, he will probably publish ads worth $300 (just example) and after expiration of ad publishing, they won't pay for ads to FB. So in the end, you will have earned $50 and burdened with debt to FB.
In the meantime, he will probably offer a big discount on forums like this,
Discount, only today FB ads wort $300 just for $250a common fraud using FB advertising system