. $200K can vaporize quickly in a deal like this, resulting in a loser.A better calculation is to take the ARV, subtract 20%, then subtract the cost of rehab plus a contingency, and the total purchase price paid by the investor, including your fee, shouldn't exceed that amount if they are to expect a successful outcome.

A water, moisture/vapor, air barrier is better to be in place, such as some kind of flashing, elastomeric products, or similar.

I put up vapor barrier, fiberglass insulation and drywalled.

The cement floor underneath the carpet apparently has no vapor barrier.

Got into a dispute with the developer as the foundation was missing a vapor barrier.

Be it glue down or vapor barrier flooring if you have areas that need leveled with float do it! 

Sure a lot of start ups will vaporize (by design, most fail), and there will be a few spectacular unicorn crashes (too much cheap money went there).

That way if they grow - erm "herbal products", they'll at least be on the hook for the bill for the power that comes from the utility above your system's capability.

the house is a ranch on about a 2' dirt crawl with a vapor barrier (yeah, you REALLY gotta crawl).

Drawback is the application and vapor.