A brand new player is usually going to not spend any money at first, and level to 20. then they are likley to make the initial purchase which includes up to cata, which brings them to 85 max. then they buy MoP and level to 90. Then WoD to 100. So... all new characters start at 90 bypassing everything including content some players don't even have access to. Brilliant! Blizzard is already having a crappy time bringing in new players, that they have to break the game completely by adding the (still) buggy as hell CRZ to bandaid a perception that the game is empty from level 1 to max level content. Worst idea ever.