It's really going to come down to what would someone pay for it.
If its minty, I wouldn't entertain anything under 10k personally.
You will have a better chance listing it on BAT honestly.
It's become more of a niche market than it was 10 years ago, while I am sure someone would likely jump at the opportunity to shove 10k in your face, I'm not sure you'd have more offers in that range than you could count on one hand. Though with that said, I've been seeing p80 x70s in good condition going routinely for over 5-10k.
You also have to take into account the market today vs the covid market, 850s x70s were hitting 10k no problem, now most are lucky to fetch 5k.
Then again I know a couple new flvc members that jumped at the opportunity to pay over 3-4k for some clapped out 850s and now they are playing the "where can I find parts and body panels" game.
Personally, while I love the idea of a yellow wagon, id likely never be a buyer simply because i've had an 850 or two now and personally I don't want to try and deal with the hassle of finding parts and fixing old broken plastic pieces anymore. But that goes for all 850s, not just yellows. I would be more apt for an x70 but honestly im about to let my s70 go with the offers I keep getting.
Post some pics.