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There are worse ways to spend $3500. If you got it for $3000, sounds like a fun bike to ride around and enjoy it. And seems $2500 ish is probably a basement price for a nice running version of this bike. So you would probably not lose more than $500, also probably not go up much more than $500 if you could buy it for $3000.
Back in the day, I had a brand new, red 1981 Kawasaki 550 GpZ. It was a reliable, fast, and solid bike nicknamed "The Giant Killer" for obvious reasons.
https://anchorage.craigslist.org/mcy/d/talkeetna-1983-kawasaki-gpz-750/7475338143.html(corrected link!)...anyone think it has some collectability?