What is considered a "good" profit on a flip to make the deal worthwhile?

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Just in general, what do any of you experienced flippers consider a "good" profit to make a deal worthwhile? I'm analyzing a deal right now on a REO but the bank has come back to all offers (5 of them) asking for our best and final offer. I've figured out all my costs and have predicted there to be a $15,000 profit when all's said and done. Just trying to determine how much, if any, I should go up on my offer, but that would then cut down on my proft.