Ok my question is to the painters out there,, I'm a painter myself but have a question that i'm not really getting a good answer to..

I've used,
R-M Glasurit
Nason
Cumberland
Keystone
Transtar
Matrix
PPG
Omni
Global
U-tech
Rubber-seal


I think that's about it..

but my question is other than sprayability and buff-ability what is the main difference...
Right now i primarily use the transtar, and have used it on and off for 4 yrs... I have not really had any problems with it, haven't seen die-back, it buffs good, I can spray it fine. and i only pay like $80.00 a gallon, so my question is to you why pay $200.00 per gallon if what i'm using seems to be working great.. am i missing something.. It actually seems to buff easier than the expensive ppg stuf..