I bought my '91 B4 3 years ago w/ 3,600 miles on it. Original owner bought it new in '91 and rode it for 2 years before he was shipped out to fight for our freedom. It sat in storage for 8 years. When he got back, it didn't run. So he sold it to a mechanic who rebuilds non-running bikes and then re-sells them. This guy cleaned the carbs, Kreamed the tank, adjusted the valves, and put a new battery in it. That's all it took to get it running. Then I bought it off him when he listed it on eBay for $1700.
I think I got a very good deal.
Since then I upgraded the rear shock to a '92 GSXR 750 and replaced the tires which were suffering from dry rot.