What type of mortgage fraud are you talking about?
has a great series on the ins and outs of fraud.
She identifies 3 types of fraud:
1) Fraud for Property (motive is pretty obvious) - liar loans are the obvious example.
2) Commission Fraud - misrepresentation by originator to get commission (again motive is pretty obvious).
3) Fraud for profit - this sounds like what you are thinking of in this post. This could net someone hundreds of thousands of dollars. Is it worth it? Should you just stick up a seven eleven for 40 bucks instead?
My guess is that armed robbery generally garners a stiffer sentence, without nearly as lucrative reward, than mortgage fraud. Plus you are taking a chance on getting shot. I think I'd pick mortgage fraud over armed robbery any day.