I've noticed something very interesting and that is players get stuck on Level 6. Last week, my little brother was playing the game over and over again and he was stuck on Level 6, so I offered to buy him crowds, the game cash to BUY new areas. So I bought 5000 crowds for him! He bought the new areas and just yesterday he went to level 17. I believe the level cap in Wizard101 is level 60, that's some serious improvement considering that he was on level 6 last week and stuck being level 6 for weeks on end.
I overheard him talking to his friend and he was on level 6 and my brother told him it was level 12 (at the time) and his friend was surprised in amazement.
Players are stuck on level 6 because they're HAVE to goto the new areas which have to be purchased, I think it's amazing that kids are amazed and their friends are on level 16. I think it's because they're wealthy and aren't complaining about it compared to someone who purchased a $50 weapon for APB. I would say this is an interesting case where an MMO wins over in terms of earning money and kids aren't complaining!