Low cost, possibly yes, but also possibly very time consuming and that has a cost.  

Vacancy hurts a bit more, but the biggest issue with renting out large homes is turnover cost.

I am just curious if you are utilizing cost segregation strategies for your investments? 

There is more maintenance cost when they are small keeping the grass down.  

Purchase price: $15,000 Cash invested: $25,000 Sub to deal - paid the seller and wholesaler $15,000 + $7500 closing costs to assume $84,000 mortgage with a monthly PITI of $575.

Target, actual 7.5% cap rate in a reasonable neighborhood.  

However, employer profit-sharing contributions (up to 25% of W-2 wages) are not subject to FICA taxes and do not appear on the W-2.To stay IRS-compliant, ensure your Form W-2 and Form 941 properly reflect deferrals, and maintain a reasonable salary to avoid red flags.

You end up with Hotel Quality sheets / soaps for the cost of Amazon or even less.

Extra 4 months of carrying costs are up most of the margin.

Or are you planning to put 100% of the risk/cost of vacancies, furnishings and tenant nonpayment on the owner with you having 0% risk?