Personally, I feel that original Sky bows (by Earl Hoyt, Jr) are the pinnacle of a master bowyer and an archery icon, which makes them more collectible TO ME....plus, the prices of the Mathews models makes the used Sky bows on the market a much better buy....again, my opinion...
Ultimately, collectibility is in the eye of the beholder. I suppose it's possible that Matthews bows would find a small following, but they weren't all that popular when you could buy a new one...
JMHO, YMMV
PS I own four Sky bows, my first NEW bow was a Sky, so I may be a little biased :rolleyes: