You get what you pay for
There are many excellent packages on Windows and Mac that you will never see on Linux. These are programs of a size and scope that you will will not see an equal developed in open source.
Those of us who need these packages would rather pay for a Linux version than a Windows version, but we will never get a chance if the purists of the world continually raise a storm and harass companies and users who choose proprietary software.
And this is a key reason why many corporations that would like to move their desktops to Linux can't. They need proprietary packages that aren't being ported because of the hostility received by a vocal minority.
