Are you implying that Parallels could release a PDM10 three weeks after releasing PDM9? The problem with that argument is that such thing never happened, and never will, not because of forums and such, but mainly because of competition, VMWare as roughly the same behaviour with Fusion. Which is supporting a version for at least 2 years with updates and release a new version (new features) once a year by the end of the Summer.
And I think you are confusing up-to-date and upgrade. As said above, each version is supported with updates for at least 2 years.
Considering this and upgrade prices versus full price, the sane choice for most people is to upgrade every 2 years be it Parallels Desktop or VMWare Fusion.
Last edited: Sep 12, 2013