Pay for your inventory.

[Fendred]

They update all character information every 15 seconds "juste in case of a crash", in order to avoid rollbacks.
That's the only reason, and quite a silly one.

I would understand why you would need a backup every 15 seconds when releasing progression content (Savage Alex), but during "normal" play, a 15 seconds snapshot of the entire server seems overkill, just to avoid a very tiny misfortune of someone losing something in a 1-2mn timespan.

So, to avoid that, no more inventory space for everyone. Hooray.

Yeah, I was just bringing up the data part of things because some people were saying that the extra costs for retainers were to "pay for server costs." If I built systems like that and got away with it, I would probably retire in my 40's from the ludicrous amount of money I just laundered from all my customers :P

Wait... every 15 seconds? I really want to know what the thinking was behind that design decision.