vtmtnman - Yes, in the last several years, the #76 to 100# Kodiaks that have sold at auction have usually gone for some pretty steep prices. Certain collectors/shooters have a keen interest in the heavy weights.
Yes, heavy weight lefties are rare. While it is true that lefties are much rarer than RH bows, rarity alone does not always equate to a higher price. Many other factors enter into the value. Generally there is far less demand for lefties.
However this is not always true either. For some extremely rare 1959 Kodiaks, some RH collectors/shooters have been willing to pay more than any LH collector/shooters, just to fill a hole with a LH bow, in hopes that later they will acquire the same bow in RH to replace the LH.
All Bow Collectors are crazy..., especially those who collect Bear Kodiaks.