Those are more passive type returns (assuming you're an LP). 

The reputable RV parks that do allow short term rentals, charge a management fee to manage the site since it is assumed you (the owner) are not going to be there very often.

Asking Price: $125,000Gross Scheduled Income: $15,900/yearLess 5% Vacancy: $795 Operating Income: $15,105Less Operating Expenses: $7,630Insurance (1% of purchase price): $1,250Property Taxes: $815Management Fees (10% of scheduled income): $1,590Repairs and Maintenance (5%): $795CapEx (10%): $1,590Misc. (10%): $1,590Net Operating Income: $7,475Less Debt Service: $681/month, $8,172/year (assuming a 5% down payment on a 4.5% mortgage, with .8% PMI)Cash Flow: -$58/month, -$697/year

I would assume that it's not convenient for them to own these properties as:1.

I am assuming I am paid off if the property owner gets current on their taxes or if the city forecloses on the property?

I would never assume that you would leave a property that needs work as is even if the tenant is okay with it. 

Assuming you are correct about the rent - it is a cash flow animal.

In addition, let's assume that all other expenses were correctly estimated including property management fees (10%). 

I'm assuming you're going to have some costs there. 

I assume that your city is going to be priced similarly to mine.