There's a few on there that are higher than new pricing! The one quoted as being 10K+ has smoked a little too much. All I can see is full exhaust and tank. I know both those items are expensive compared to XRR pricing, but that doesn't mean they are 3 grand worth.
As you mentioned, parts don't add to the sell price, they help sell the bike.
3800 was a good deal. I've seen them over the years get listed for that price because they don't have a huge market. It's a solid bike for that price for sure though. 7500 used? Eh, there are other options just as good, or better. It puts you into Xchallenge, DR/XR, high mileaged 950/990's, TE610/630, GS800 and 690 range.