So I don't follow CO STR stuff other than basic reading posts here and some other places as well.I hear you that we are talking about primary residence STRs but that can change just as fast as non occupied IMHO.

They will normally charge you for desk space, using their printer, support from them and their office staff, Etc....Then there are MLS fees, Lock Box fees, Continuing Education costs, and the basic costs of running your own business.

I'm able to build these rental cabins at 65 to 70% LTV and sell some for income and hold some to create another portfolio at basically a BRRR method. 

As a PM with 65 units, ours are basically identical to that

They would pay us, the management company a small non-refundable annual fee that is basically a third of their traditional deposit.

Yup, and that's just basic 101.

My view is that the extra income from STRs/MTRs basically compensates for the extra effort.  

The entire town is in a property owner association(basically and HOA).

You just illustrated part of the risks of buying from a wholesaler and not using an agent.

Basically, you are trying to jump the gun.