I would think-hope that any neg stands a very good chance of being removed because no buyer is entitled to partial refunds even when their complaint is legitimate (how it is resolved is entirely at the discretion of the seller, and while partial refunds can be considered standard practice due to making some things easier when selling online, officially there is no entitlement), therefore the comment "if you do not agree I will leave a neg" is feedback extortion. 😉

I am still curious about how/why they feel this affects the camera's value, but likewise I would not let them bully me into anything.