I think the missing information is~
What price did the seller originally purchase it for?
Most sellers bought direct from Disney. What year?
Do they still owe money on the contract if they accept your offer?
Do they have other family members on the sellers side that are reluctant to drop that low?
What is the
emotional attachment of the sellers?
The contract might be the one Dad bought to give his heirs.

It could be someone who is angry at prices going up and “your offer“ is fuels that
”ripped off” feeling

It could be someone who will profit from your low ball offer, because they too
bought a resale contract during a recession, or bought 20 years ago.
From my recent experience,
I decided what I wanted to pay, then found contracts that I thought fair and didn’t negotiate.
Even then, the seller didn’t sign after they verbally agreed.

Or not pass ROFR. Again, it happened to me.

Finally, I got a contract for BWV, the resort I really wanted for the lowest price at the time.
The resale process takes patience and time.
Remember the killer deal you get will still be less than Disney is selling it for now.
Good Luck!