[jjtheblunt]

Software (Wolfram Mathematica is a prime example) does this too, with huge discrepancy between the pricing for individual home use and individual use if in a business place.

As I recall, it was a commonplace pricing scheme 20+ years ago in the Unix workstation times: if you were buying Framemaker (later acquired by Adobe i think) for NeXT or Sun I think it was more than if you were buying for Mac or Windows.

[kyriakos]

This could be attributed to the cost of porting to those platforms was more expensive per seat since there more windows and mac users. Especially at an era where cross platform usually meant full rewrite.