End buyer tries to change original terms of contract?

[Jason K.]

I'M DEALING WITH THIS SCENARIO AS WE SPEAK!!

Have often does your end buyer investor try to change original terms of your wholesale contract? I've agreed to a price higher than what I contracted with for the homeowner but he's requesting other changes on the contract.
For instance I have an end buyer who wants to change/amend closing date, and option period, closing costs, and a few other things to his liking.

Obviously, I don't think this will fly with the seller since I'm (and/or assigns) already under contract with her. Why would she agree to less attractive terms than she already has?

I just want to know how often this may occur, and if I should even deal with it. IMO, if he doesn't agree to the terms I got with the seller, then move on and let me sale to someone who wants it more.
Advice?