Oh it certainly did! PP2012, PP2014, "PP" stands for Poser Pro. PP2012 was the "Pro" version of Poser 9, PP2014 was the "Pro" version of Poser 10. Whether there was a PP2010 as a "Pro" version of Poser 8, I don't recall because I was absent from Poser from version 5 until version 9.
As far as Poser not being "Pro" . . . well if you're going to compare it to Autodesk's Maya, and the like, no it's not a professional software app, but there have always been 2 versions of Poser since version 8 (don't recall about version 7), and they decided to call the more expensive, all inclusive, version Pro rather than Advanced. This is how it's done for all kinds of software, not just 3D graphics software. Just because the software "may not be" used by professional artists, has nothing to do with the name. That's just a distinction between the version that has it all, and the version that's been trimmed down.