Your job isn’t to negotiate price over the phone, especially when you are working with a very limited amount of leads.

The warranties provide some degree of"protection" for repairs initially after closing.

Then renegotiate price, credits, repairs etc based on your findings before your inspection period ends. 

@Conan Humphrey I just had a phone call with Josh Holland - young wholesaler in Sherman/Denison, Tx (Grayson Co).

I know which company it is and I have a phone number.

Use this fact.Download a recording app on your cell phone and turn it on when you have a conversation with these types.

In order for them to buy your house, I must do an analysis on what I think the possible repairs would be on the property and I make an offer to you based on that analysis.

Either way, you will find that the price would be 10-15k on the very low side for just the plumbing (not the drywall repair) and probably double that or more if you use an expensive plumber. 

Replace and pay through the nose.If water came in due to foundation problems, Repair and pay through the nose.

It's only roughly $100 "per door", but our goal overall is total cash flow, so $350-$400 total after all expenses and saving for repairs seems good to us.