A few other items to note: I'm pretty sure there are rules against brokers and salesperson sharing fees with a non-broker/salesperson in many contexts.

If they are motivated at that time to redeem, they will also have to pay your legal fees for the ejectment.If you have a tax deed, you can just give some sort of deadline in the letter and file ejectment after the deadline expires.

Here’s the stats - -$500 to activate line (credited back if deal closes in 90 days) 
- 3.5 % origination fees 
- Close to 10% rate 
- Each project is reviewed/underwritten by FoA, which could take up to 30 days 
- Up to 90% acquisition & rehab, I believe 
- Standard draw rules on rehab side - Line is up to 5x of assets, equity in home, 401k, etc- Line has to reset to zero once per year

I want to know I can make a go of this before I start investing in the annual fees. 

Couldn't I list it myself somehow, paying a small fee, or even simply sale as a FSBO, utilizing a 2000 marketing budget or what not?

It also means you are paying an extra fee for this middle man structure.  

(Mgmt Fee = CapEx % since this calc does not have that)

Then the investor assigns the agreement to a tenant buyer with the approval of the seller and the tenant buyer assumes the rights and obligations in the lease option agreement and the investor collects the assignment fee and moves on.How would a real estate agent assist the investor in this process?

Property taxes, insurance, utilities, HOA fees and loan/financing costs are some of the ones I've recently learned about.

Our strategy is a 3-5 year flip that when you add up the cash flow, the tax savings from depreciation, the mortgage debt pay down, and the fact that we bought it under market value and that we are selling it on a lease option so we don't need to pay realtor fees and have minimal closing costs, our average total profit over a 3-5 year period is round 60k per property that my partner and I split.