#1 - you will run the risk of being able to retire from any full time job you currently have and may wind up sleeping in early every day.:)

This is a great ideal and I think most of BP is sleeping on the important of marketing and growing your marketing budget.

People with sufficient income move from areas with high crime to areas with lower crime.

Would they be more willing to underwrite on a permanent green card once she has sufficient work history?

My lease says 10 days notice is required for me to terminate the lease and I've verified that's sufficient with an attorney here. 

Sufficient to say having both a LOC and a mortgage will provide me with two strategic debt instruments I can manage over the long-term.

If they have not then the small discount they are offering around 10% is not sufficient for the real risk on the loans.  

Do you heavy hitters sleep at night?

Your job is to find great deals with both sufficient equity and sufficient positive cash flow to create good security for your lender and yourself, and start flapping your lips so people know that you're an investor and you work with private lenders.  

The only big problems I could see with the business idea is (a) keeping the apartment complex from competing with you, but you can get around that by doing a contract with them for a set amount of time and also compensating them sufficiently so they won't want to bother competing with you and (b) I think you might cross into some code enforcement issues in some municipalities if you do that.