You weren't considering buying it without seeing it I hope. On a sled I wouldn't consider low miles an issue. We have several spares that have very low miles for their age, nothing fishy, they just do not get used much. Then there is the issue of repairs to sleds. I bought one I know had more than one major insurance repair done that the PO admitted to. Sled looked good so I bought it. Never had an issue with it and you probably wouldn't know it had been rebuilt twice if I didn't tell you. Then my new sled had an incident last year, needed a new bulkhead which means a new tunnel and it was completely rebuilt at the dealer on my insurance companies dime. Sled now has a black tunnel instead of green. I am sure I will be asked when it comes time to sell it. Nothing to hide though as it rides great and has no issues.
Sleds are not nearly as complicated as new cars and trucks. Repairs are often a part of life with used sleds. I sold my Axys with a replacement motor but was completely honest about it and had no trouble selling it. I never heard anything bad from the buyer so I assume all is still well.
Moral... Buying something with a story isn't necessarily an issue IMO. Dealing with a forthright seller though is important to me. Fixed is OK as long as the fix looks good and the seller is honest about it. I agree with the others though, if the guy is a douche, just walk away. There are plenty of sleds for sale.