They just want it sold for the agreed price and the agreed time.I, as an aspiring wholesaler, will operate legally, ethically, honestly, and be as transparent about how I operate to both the seller and the buyer.

A real investment fits your model from day 1.

I also have them write the year, make, model and plate number in the lease so I know who is who.

Drive the neighborhood in a spiral to make sure you aren't in one of those undesirable pockets.Those ARVs sound a tad high for the area.

How many properties do you aspire to hold?  

Your domain caught my eye (very catchy). congrats on your successful business model, looks like you're helping connect a lot of REI's with the right people. 

The idea is to get away from variable pricing such as billing per hour or billing per "journal entry" and move more toward a client centric, value add focused pricing model.

I worry that it's not a sustainable model.

I'm a realtor and aspiring wholesaler here in Central MA.

This is not judgement on Silverwood's business model, just an objective statement.