J.W.
You were actually very generous. I was the first to put up a fence so mine now has six neighbors using one section or another. When the wood one fell down I replace the whole fence with vinyl and expected nothing from my neighbors. I kinda felt bad for my one neighbor because he picked cedar because that was what we had but white goes with everything.
Anyway my point is you actually had no responsibility to pay for anything. If one of my neighbors had offered I would have declined. Pretty much that fence sits in my yard albeit only by a couple inches. No way I would want anyone to own a part of something that sits in my yard, ya know?