I successfully completed my first one nearly thirty years ago.Of note to would-be players: Surplus funds are generated by mortgage, deed of trust and certain types of lien sales whereby the forced sale generates an excess above the secured debt and cost of sale. 

When told that it would cost $X, an amount which the Client deemed excessive, he was asked what he thought the return would cost.  

I don't need lump sum, I need excess to equity when I would need, aka HELOC like investment.

Let's see:6 AM: Wake up for my pre-dawn personal body massage7 AM: A quick swim in my Scrooge McDuck Money Room8 AM: Breakfast with Warren, Bill or Elon depending on my mood9-12 PM: Counting and arranging my fat stacks of cash12:30 PM: Lunch with whichever rich Sheik is in town2-5 PM: Inspecting the underground gold vaults6 PM: Board the Supersonic for dinner in Bali10 PM: Have 4 gymnasts carry me back to the crib11 PM: Lights out! 

Anything in excess of 10% is very good.

I am usually for solar, but this one is excessive.

Additionally, you and the seller agreed to handle and shortfall(Yes keep in mind you could have been shortchanged as well) or excess will be handled outside of closing.So, if you owe the money you should pay it just as you would expect the same. 

Do the investor or original owner have an opportunity to recoup these excess funds?

Have you had any issue with crime or excessive damage to the place?

I believe Evolve provides a service like this, which they charge 10% for, which is excessive to me.