To start... I woudlnt' buy it...
BUT...
It's a clean, new-er ski. It's realistically worth $3500 in good running order. Maybe even as high as $4k depending on location. So... $1750 + $1600 for the SBT engine shipped.... that would get you a clean ski, with a good engine, at market price. But, that's assuming nothing else is wrong with it.
It's not totally out of line, and some people to get into bidding wars. (that drives prices) also... you cloud take that ski, as-is... and make more that $1750 parting it out. The aluminum trailer is worth +$500. I sold the aluminum trailer from my Polaris, and I had guys fighting over getting it, when I posted it for $450.
The reason I wouldn't have bought it is... when I buy a "Project"... I want to save money in the end, since I have my labor into it.
I will say one thing, these days, its getting harder and harder to sell a high end 2 stroke for anything over 3K. I had my 01 RX for sale for almost 3 months, prime season, started at 3500 no trailer, ended up 2750 on a double. and this was with a brand new engine under warranty !!! to expect to draw more than 3K, it better be sweet.... i mean real sweet. (I just paid $3500 for a 2006 GP1300R , with $2800 in mods, a brand new paint job, and a box of spare parts (and a bannana boat !). if you want to get $3500 for a 2 stroke you better be near the canadian border

they really are getting cheaper every day. (i paid $1200 for two ski's similar to that on a double, and he had them for sale for a month, asking 2,000.)
with that said... that GTX is a really good looking model ! and looks very nice, but i'm in the $900 range non running for that myself, maybe $1150 but only if i'm going to keep it as a personal ski, as a flip, $900 is absolute tops. also, if doing your own rebuilds, you make your own labor there, a good used crank (250) , and a top end kit with cyl boring, (400 + ship) and your looking at a nice flip, you'll save another $100ish if you do your own boring at a machine shop, but its getting cheaper for 951 kits these days that it makes sense just to send them out, less work. you have to create a lot of wiggle room with a flip, title fees unless you leave it open, registration, ticky tack stuff like cables, gauges, new mats, alignment tools, trailer lights, bearings, gas and oil for test ride, carb rebuild kits, the list goes on and on. if you only leave a few hundred in wiggle room, 2 or 3 calls for parts can eat that up quickly. if you leave 1K in wiggle room (ski + parts +1000 = sale price) then you can afford to do a flip and if you have to spend $300 on misc, your still ok, anything less then your better off getting a part time job at walmart instead.
the bottom is dropping out on the higher end 2 strokes, but thats, at least IMO, a good thing... means I can get something like a nice 2002 GTX like that for 1500 less than just 2 years ago.
summary: imo, realistically $3000, high end 3500 these days...for a nice high end 2 stroke. and in florida subtract 15%. if the market remains strong in the north, you'll start seeing ski's getting shipped up there.
and man oh man, i need to find a way to drag like 10 trailers up north,,,, you guys are getting raped on trailer prices !
re: bold, I don't see $1750 there in parts.. what am I missing ?
re: bold, yes you gotta get paid for labor, IMO $20 an hour is minimum, if you can't get $20 an hour for your time as an absolute minimum, then its not practical in the long run. when i'm thinking flip, i'm thinking $40 an hour minimum, and i'd like to see $60 otherwise you lose the risk/reward ratio. when helping somebody out, then $20, anything less than that and i'd rather watch M*A*S*H reruns and drink cheap beer.