Pay for your inventory.

[WHS]

There's no technical reason for this that makes any sense at all. SE just wants more money from you and they've figured out how to get it.

Not even free-to-play games charge you MONTHLY for your expanded inventory space.

I don't want to pay either but there is a technical reason. Server side refresh / save ratios. What I mean is how often the serves save data. i don't think it's really a space issue on the servers as it is how many times per minute a save is made on the complete characters set of data. Just having more than one character which you can only log onto one a time btw, does not change this formula much. Having a character with large amount of storage to refresh does.