Hello Fellow Bigger Pockets Friends,I have been analyzing various models (already took action and bought investment property) to get to my freedom number i.e. monthly passive income goal to replace my expenses and maintain lifestyle.

You are right that if you create an economic incentive to return your property dirty you're going to be "underwhelmed" by future cleanliness at turnover a lot more often :).Sounds like you have a good model that is working - don't change it over one bad apple.

It is not a good business model, and at some point the money they hemorrhage every year will catch up to them and they will be out of business, or need to move to a different business model.

Reminds me of like an Uber business model only for real estate investors.

Eventually, you may want to do cash flow models and projections.

I use a pretty simple model for the debt I carry:If any particular debt is at...say 4% and I can put my available funds into anything that nets me >5%, I carry the debt vs. paying it off. 

Most tiny and park model homes are rated rv, and so can be placed into a mobile home park.

In fact, you've outlined the basic business model for many hard money lenders.

You will have to run the numbers to see if it fits your business model. 

The business model is fairly simple, they buy them at a discount from people who need / want the cash and resell them at a smaller discount.