That's easy. I've has PLT for a year, and enjoyed it. I'm pretty sure that I would not have been treated as well, or had as many benefits as an elite that 'only' flew 75k in 2012. And now, With the help if a $40k spend on the World Elite MC, I'm at 86k for the year, with enough to travel planned to reach EXP in Oct.
So, although I've really only been flying regularly for two years, and I feel like that would be wasted if I didn't get to enjoy the new planes coming online right now as a top elite.