Just out of curiosity I looked at the Sea Eagle website. From what I can see in the picture that boat is a Sea Eagle 9, which is 11 ft. long, not 16 ft. long. Not made of rubber. made of Polykrylar, a heavy gauge vinyl. A brand new Sea Eagle 9 package with the floor and the motor run $729.
I may be wrong, but I don't think rafts appreciate in value. If they do, then I've been selling mine for way too little money!