Learn to ride a bike on a flat surface before attempting a downhill backflip.

Or, in the same fashion, do you generate your lists in a hybrid manner, and still purchase equity lists "ala carte" from other providers (where easy to obtain), and focus on the harder to reach lists with your membership service?

Glad you are getting back to it after some health issues, but these are surface additions.

Tools like BeyondPricing and Wheelhouse and Pricelabs all operate in a similar fashion and can do a good job. 

I've remodeled two properties myself and only scratched the surface. 

Yes you can and on the surface it makes sense but as others outlined there are other factors that come into play.

It's basically a lifetime surface unless you damage it.

@Genny LiCan't agree more on granite being out of fashion, sounds so 90's. :-)Can I get marble look laminate in big stores such as Homedepot?

I pressure washed off the black moss on the brick in the back of the house and back patio along with all other concrete surfaces which made it look new.

You need to create a spreadsheet either on the old-fashioned spreadsheet paper, with Excel.You need to calculate the profits for hundreds or thousands of properties to determine what your profits will be based on many things I am not going to list because I am on prescribed narcotic, but some of them start with purchase price, rental income profits after all expenses, profits earned from your tenant's help paying down your mortgage, the amount you will earn from expected appreciation (but you can't believe one word anyone tells you about how a property will appreciate, the other 10 or 20 things my brain can't think of and my next most-important thing you (nobody else can or will do this for you).You never estimate how much you earn on a property by listening to anyone because the numbers almost never look pleasant during the period the property is for sale.