I tire kicked a few over the years, cost me a lot of money...
If the backglass is good, $2500 is fair market value. (they did remake it, $300)
I don't think it's done inflating either. In the last 5 years they have been on a seriously upward trajectory.
A decent one went off on ebay for $2700 a month or two ago.

It's fun.
You may tire of it after a few months, but your guests will love it and be pissed if you sell it.
It's an incredibly easy game to sell.
Desirable and rare enough that most people will have no choice but to pay your price.

You guys keep saying you can get a lot of pinball for that money, which may be true, if you just want more pinball machines and you aren't into diversity in a game room.
Ice cold beer is one of what has become a list of very few arcade games you just can't duplicate with a multiboard or emulator.
Unique arcade games in general have been on the rise.

I've had and played quite a few $2000 pins that weren't as much fun as ice cold beer.

I won't keep mine forever, but i'm glad to have owned it.

For you guys that do own it.
Buy these
http://www.jbgaming.co.uk/controls/zeroplay-bearing-kit/
It is amazing how much more solid and precise the sticks feel.
Takes every ounce of slop out.

Replied to your pm,

But so everyone here knows, 21mm, no handles.

I'd say they say sell for similar money, unless you find the guy that absolutely has to have zeke's peak.
Zeke's peak is most likely much more rare, but with so much demand, I think anyone takes the first they could find of either one.

I have a icb, but i'd rather have a zeke's to go next to my zoo keeper.