I've found that when I try finding other deal types or other business models or niches, I end up losing a ton of valuable time that goes nowhere. 

Losing a house to unpaid taxes can be devastating, but there might still be options. 

You can not lose anything and no one can take from you.  

Fourplexes in Georgetown today easily top $600,000+. 

Are you able to reduce your expenses quickly and easily if needed?

Average rents are $1,250 (Again Zillow) Easily a losing propostion.

Are you able to use it easily, only with a HELOC.If you lose your tax deductions, then Uncle Sam is happy to take more of your money each year.Good Investing...

This also leaves me with $3,750 stuck in the deal (not including financing and closing costs, which could easily add another $20,000).In total, if I had to include closing costs and financing costs, I’d have about $23,000 (if not more) tied up in the deal and lose close to $700/month before accounting for expenses.

Most investors make the same rookie mistake: They focus on problems instead of people.
Telling sellers everything wrong with their house and justifying your offer with repair costs doesn’t build trust—it kills it.
...

However, you can't sell something unstable, with circular references, requiring human override, etc.But, if you stabilized it, the model loses efficiency.