The most basic offering for sellers is a flat fee MLS listing.

But they take fees from you and charge the tenant more.

I would be using hard money lending (I've heard it's around 10% with a 1% origination fee) .  

You can write into the agreement that the borrower pays the servicing fee.

I believe most places charge a 3 percent fee or more

If that was the case I would let the in-process HELOC go, and shoot for a refi and HELOC at the same time next year to avoid duplicating fees.

I was shocked as I thought it would be very simple (which it is), but some syndicators will use funny math such as not counting fees, placing expenses on a quarterly or yearly basis when using IRR (backloading to end of year). 

I don't charge security deposit or move in fee nor do I care about credit. 

One issue I've uncovered in this is that they also add a $75 "admin fee" in addition to the percentage based "supervisory fee."

I tried getting heloc from my large bank, However I was denied due to my income. if you can't get the credit lines for some reason from your bank then they have resources for that, even their own cpa you can use for a fee.