I dont think Fleet Flyer and A and C are actually all that far apart.
On the one hand the aircraft is clearly worth that much to Bose and doubtless was in superb condition. On the other hand if it ever had come on the market it is very unlikely the owners would have recouped their investment (although in this case I am not quite so sure as the sums involved are pretty small). In general you tend to get only a fraction back of the money you spend on aircraft, and houses, cars and similiar chattels are no different - of course, as always there are exceptions.