the same applies to PvP ladder tokens, arena tokens & RP (GvG) !!!
You're exactly right - certain people and guilds will profit if they've been saving. However, GVG and Arena token rewards were unbound, so those items could be sold. PVP items (the ladder rewards) are not unbound, so those few that have the tokens will be able to drive the market.
If PVP ladder rewards were unbound, those who were saving up would profit greatly since they have the biggest banks, but probably less so than if the rewards continue to be bound. On the flip side, if you unbind the rewards from the ladder, in the end, you'll see less participation in the I would assume, as players would just be able to buy the items needed to invent items through waiting and paying rather than participating.