The plural of anecdote is not data indeed, and what was provided was anecdotal evidence. However, was there any evidence provided to the contrary (users do buy software on CD)? I think the reason the anecdote was upvoted was due to the lack of supporting evidence for the contrary conclusion. I'll give you games and movies (although Steam seems to be making great inroads toward making CD games obsolete), but I sincerely doubt that the majority of Mac software is purchased on CD and not through the internet.