Just to clarify, I use MediaJukebox since version 6 and yes, I too think it is the best media management software out there (at least that's my knowledge of the market a few years ago when I bought it). I'm using it mainly for that aspect, not for ripping, not for burning. I'm organizing my MP3 music library with it (several thousand files ripped from my own CDs) and for this task i don't know any other software which is flexible like MJ.
The licensing issue has been discussed here intensively before. What annoys me about the licensing ist not the limited number of installs but the fact that installing is only possible if the JRiver website for this pupose is online. Therefore, if this site should (for whatever reason) become unavailable in the future it would never again be possible to install MediaJukebox on a PC. I don't expect JRiver to go out of business soon but you can never know...
So, why should I put effort into managing my music library (and it IS effort, even with MediaJukebox) if I cannot be sure that I will be able to re-install the software and use my library in 3 or 5 years from now?
Therefore I stick with my old version 7 license file which I can always use to install previous versions up to MJ8. I only hope that JRiver will at least provide the basic support and fix the existing bugs (especially when this has been done in MediaCenter already). I'm not asking for new features.