Price wise, I'd say you're pretty close to being market value but it's a matter of "what's it worth to you to sell". I'd check other machines like yours on places like:
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Myself, I have a machine (tractor, UTV, ATV...) valuation tool I created many years ago that was pretty close to spot-on. Unfortunately, it's on another computer I'm not near right now.
As I recall, it was something like:
Starting with retail price or price paid, reduce your price by a couple hundred $/year of tractor age and $1/hour of tractor hours. Adjust for machine condition. As for aftermarket accessories... don't plan on them increasing value too much and definitely not what you paid for them.
But that was then (20 years ago) and this is now. Due to inflation and other factors, well kept, older machines are really holding their value. New machines are so outrageously priced, well-kept used equipment is valuable.
Examples:
I have a 1996 JD 770 tractor with loader, great condition, about 800 hours. I paid around $11K for it new, 29 years ago.
Guess what they're going for now... Right around $11K. Inflation has matched depreciation and I could probably sell it for what I paid for it.
My 2004 RTV with under 430 hours is in near new condition - I paid around $10K, added about $3K in accessories. Since the new ones are so expensive, same story. Old iron holds it's value.
Here's a list of old RTV's for sale. Condition wise, these are 7-8. Mine is a 10. These 7-8's are selling for almost $9K