I would call it a good deal. Polaris makes some of the best snowmobiles, and depending on how many hours he has on it, could still be worth alot. Snowmobiles do require some work (well you drive a CJ so you should be fine) but are totally worth it. Just ask him for all the info, like the hours he has on it, maybe i read it wrong but i didnt see him mention it. If i was you, and i need a fun toy to play with but i dont want the jeep any more and didnt NEED money for it, i would take the offer. When in doubt, go to the snowmobile forum. Good luck!
P.S You may be well aware of this, but when buying/trading vehicles online with someone, its important that both sides of the party have some form of a gurantee (make sure everything is good with it) i notice alot of people now a days just buy and sell and hope it works.
No, i think its a good idea (if you read my post closely) if you dont need the money from the jeep, snowmobiles are a whole other project and the deal hes giving you will be a good one if you plan on doing some work, as i mentioned earlier. Bottom line, if you dont need the money, and you plan on dumping some extra $$ into a project, yes the deal he is giving you is good (to answer your question). Now, Weither its smart to get a snowmobile in the first place, well thats up to who your asking, to me, its something that i would do, Because i love snowmobiling and work on several.
Just be prepared both emotionally and financially for things to go wrong.
I once bought a 1996 Ski-Doo Formula III it was in fantastic shape and drive real well I paid $2,800 for it. I had it checked out by a mechanic before I purchased it. After riding a couple hundred miles something clogged the jet in one of the carburetors and damaged that cylinder and twisted the crank slightly. It cost me about 2,300 in parts and labor to get it back running again.
Not that this going to happen to you, but it's the kind of $hit that happens and it's usually when your bead broke to begin with. You have to be prepared to "pay to play" as they say.
If I were going to get another snow mobile it would be a brand new one or damn near even if it meant financing. You just never know for sure how a sled has been treated/maintained even if it looks pretty( like my Formula III).