Impossible to say without knowing details of care, not sure use even matters that much since everything is replaceable.

Personally, I use mine 5x/wk - if I was to sell it as is I'd probably ask $500 less than I would if it was within a few months after I perform solid maintenance/replacement.

That may not help, but it totally depends on the particular machine.

Sold mine on eBay back in May for $1400. Was 12 years old but in good condition. Couldn’t give it away a year ago.