It's common sense.
puts on obnoxious voice Hey, I'm bob and I'm level 69. I didn't get anything when SM Reloaded R3tar3d came up, so I didn't get anything for those previous levels. But I'm fine with that, since new players are getting stuff and I'm not.
Maybe I'm being ridiculously one-sided. Do explain to me why else you would think people wouldn't want compensation.