There are a lot of low mileage Rebels sitting in barns out there. People buy them, park them, let the tires rot and the gas congeal in the tank and carbs while the tank rusts. Then eventually someone decides to sell. Typically the new owner replaces everything, coats the inside of the tank rebuilds and cleans the carb and then the bike is ready to ride.
Rebels are not particularly collectable, even though the Limited was an attempt at making a "limited edition" model. A very nice low mileage Rebel that runs well would command a small premium over one in average condition.
2004 Rebel 250, 2003 BMW K1200GT (roadburner), 2004 BMW R1200GS(all purpose),
1973 Norton Interstate (in a box in the basement)
1968 Triumph Bonneville