Quote - Quite a few software vendors actually DO charge more if you are upgrading from an older version - it was one of the BIG reasons I decided NOT to upgrade to World Construction Set. Why should I pay more when I never got to use the improvements in the version above mine? Well, this is just my opinion, but 3D Nature lost a sale because it charges more for older upgrades.

Well, presumably those improvements will carry over to all future versions, right?  For example, Poser 6 retains the firefly renderer from version 5.  So if you were upgrading to 6 from 4, why should you only pay for the features that were added to version 6 and not the ones added to version 5 that you never paid for?  I don't think the Poser 7 upgrade is unreasonably priced, but I expected at least a $30 difference between upgrading from 6 and upgrading from 5.

I still think blender has the best upgrade pricing. ;)