People dont care about snow conditions in November, its a clean slate and the outlook is always positive! This is why I typically list my sleds for sale in this time frame and I have always gotten top dollar for my higher mileage rides. I believe it also helps some to have sled not so typical to the area. For instance, I just sold my 08 Summit X 146 this summer for $2000 less than I paid for it 4 years ago and the reason is the people looking know there aren't a ton of used 146X sleds laying around MI. It also makes a difference on how you prepare your sled for sale, I don't care how old it is it should be clean, clean, clean! You wouldn't believe some of the used low mileage sleds I have looked at buying and it looked as if the thing had been sitting in someones yard all summer.
When listing my stuff I browse some of the sled sites classifieds for comparable prices, I then compare to NADA and typically drop the price a few hundred.