Is this 2017 fz10 a good deal?

That sounds a little high to me, especially for a 2017 with almost 20k miles on it. I've seen newer bikes with less miles and more goodies for that price on facebook. KBB does say that a typical listing price for that bike its over $11k though so IDK lol

It says my 2019 has a typical listing price of $12,700. I paid $11,999 for it brand new lol

I'd try to get them to sell it for 9k. My guess is they paid 8k and below for it on the trade in value just because of the color changes to the fairings and wheels. I'd ask them to pop open the seat to see if there is a dynojet in there as the guy put a sticker on the frame. Some people love to do that when they add a mod, my motorcycle had stickers on it of the mods he put into the bike. If there is a dynojet, you could argue the bike has been heavily modded and you're looking for something stock. If there is no dynojet, say you're taking a risk in that the cat is gone and you have no idea if the bike has been flashed or not which can cause issues as the 02 sensor doesn't looked plugged in. Even if you like the colors and mods, act like you don't. Say you wanted one stock with the cat and green fluo colors. They might be willing to deal if they paid 8k and under for it and need the sale.

What is the tape looking thing under the windscreen? Also the tank grip in the middle looks strange, like there is left over adhesive and he put one on top of it. I'd go see the bike in person as you'll probably notice some things that are bit janky. Use those to get a better price.

Also keep in mind at 20,000 to 24,000 miles it is highly recommending to get a valve clearance service done which can be expensive. You might be able to leverage that into a lower price or a deal on their serivce for that job.  

That appears to be too much for that bike. +1 on what “cowthulhu”, “Will84”, and “tennifreak” said.