Obviously with the f2p for lvl 15 they were laying the ground work for this f2p to lvl 50 switch. If you look through my post history I predicted when the f2p to lvl 15 was announced a cash shop and f2p to 50 would be following. So it was really was just all prep for this f2p launch. They probably did not make the decision until sometime after but figured it couldnt hurt to lay the ground work first.
I got news for you all MMOs are money grabs. They are made for one solitary purpose. To make money. If you thought differently than welcome to the real world.