Depends on how they are equipped. There were lots of options levels offered that can swing prices by a couple of thousand.
Yeah, I've noticed that too, the airbag and navigation models, with heated seats and grips, and the dash change in 2007.
I've seen a few black ones, 2007-2010 with heated seats/grips, driver backrest, passenger armrests(which are expensive to add, and worth looking for already on), in the $7500k-$10k range, with miles from low teens to 40k-60k.
Some had new tires, aftermarket suspension, highway pegs, and a few other farkles.
From the early 2010's, the GW's jump to $14-$16k here, for basically the same bike.
The latest generation are high teens to low $20k used.
For what it is, and how much I'll use it, plus riding my gsxr, about $10k is about the most I'de want to pay for one.
I still see crazy price variations on the same bikes here, but all the ones on FB are owned by retired, elderly, or selling for dad in the profiles, and they all look well cared for.
I think between being a Honda, and the type of guy that buys these new, if the bike isn't leaking, making noise, and rides good...then it's good.
It'll still be running until you can no longer buy gasoline, lol
I'm just waiting on the right one...