I own thirteen mobiles in one of my parks and the only way it pencils is that we A) take very good care of the homes staying ahead on the maintenance, B) Rents are high in the area so we can charge $550 over the pad rent which is $450- so $1000 per month.  

I manage the property and the tenants, pay the owner of the property a rent that meets their mortgage plus a little profit, charge fair market rent from the tenants I sublet to, and exercise an option to buy the property after a predefined term and at a predefined price.This way tired landlords don't have to manage their property anymore, and I start investing with little to no money.

Or They charge much higher fees per transaction.The one Im with for $40 a month, is 100% commission structure.

Like the Martel folks currently who charge 15k or so to tie into their network..

Quote from @Harita Konjeti: Tenant has not paid entire rent for first month, do I have any other options other than charging late payment? 

In my market there is only so much you can charge for a house.

I charge a really high fee and require the tenant to carry bite insurance.Inspections are done on a schedule and always recorded with pictures and/or video.

At my day job (non-RE), we have a recurring vendor that charges us about $150K/month. 

I also do a lot of market research in each of the markets we operate in to understand how much comparable properties would charge.

Lightning Docs, which we use, charges $500 per set and I believe Doss charges $400 but we haven’t used those.