re: Backing out of Purchase Agreement

Just b/c you can sue for the 10% doesn't mean you'll get it - you'll have to show you incurred damages sufficient to compensate the award, which is going to be difficult to do with only a 10-day delay. You aren't going to find a skilled attorney to take that on a contingency basis either, so it's going to cost you to pursue it.

I would drop it - if you can be honest with yourself and come out convinced that this 10-day delay cost you some money, then keep some of the deposit. But I'm guessing you can't.