My thoughts exactly.
Over the years I've bought and sold a lot of what would be considered 'toys". Has it pained me a little to see some of those toys leave my driveway for the last time knowing I'll never use/ride them again, much less probably even see them again? Yeah, a little.
But none of them were particularly rare, and sentiments fade easier when you use the money to buy something else that whets your interest at this moment in time, vs something that whetted your interest years ago and no longer serves a particular purpose anymore.
I also looked at a lot of prospective toy purchases over the years that had fallen into the sentimental category for someone and had basically deteriorated so badly that they had a severely decreased value. Bad enough for someone who is handy who can replace old cracked fuel lines and seals, repair wires chewed up by rodents, fix or replace cosmetic damage caused by neglect and age, etc... but for someone who has none of those skills and would just need to take it to a shop and pay potentially thousands of dollars for the work to get done, it has a major effect on how much people will be willing to pay. I looked at a lot of junk that people thought was still worth big $$ that were basically glorified buckets of parts, or just plain scrap.
And yes, the longer it sits, the more work it's going to need to sell it. The time it's been sitting so far isn't crazy long - provided you stored it properly with fuel stabilizer and the other basic precautions for winter/long term storage, aside from perhaps tires, a battery (if it wasn't maintained) and fluids chances are good it doesn't need much to get it back on the street again.
Add in another few years or sitting and that's going to change. Plus more depreciation.
Sell it. Buy another down the road if you want to.