The Role Of Software

While reading a discussion in a mailing list, I ran accross something like this:

"Heh - people make their living tuning Oracle. Come to think of it, there are software companies who's sole purpose is to provide tuning applications."

Well, why can't we say "Come to think of it, there are software companies who's sole purpose is to provide tunable/must-be-tuned applications."

So, what's the role of the softwares I've written?