I am in the market for a GOTLE but unfortunately you are about $1000 over what they're selling for on Pinside right now. The "trolls" are just trying to let you know that it just isn't going to happen right now. I agree with you that the game is "worth" $7000 but that's not what people are paying on Pinside, even for nice HUO machines. There is a great one on here right now that is sitting for $6200. Another one last month started at $7000 and dropped all the way to $6000 before it was purchased (by me). Luckily for that guy, the dude that was buying his LotR offered him $7000 in person when he saw how nice his GOTLE was, but that seems like a rare situation. You also have to know that a topper and mods are never going to recoup their cost. You buy those things for you, not for resale. I assume you also have an ad on Ebay and Craigslist. If not, you should.
If you're not willing to "take a bath" on this sale and don't really need to sell, I suggest you take the ad down for now and you won't have to deal with the "trolls" and "usual pinside instigation". This just isn't the right time and place for a $7000 GOTLE. Also, you can't drop the price and then raise it back up. I've seen car/ATV/boat/camper/gun/etc dealers do this. If someone has seen the lower price, they know you'll take that (as does everyone who sees this thread). So really, you aren't even getting any interest at $6800 right now.
Good luck.