Controlling the economy is another reason why I believe ANet continues to introduce gold sinks, like the current Festival Games. I 'lost' more than enough gold (and not nearly as much as many, many others) to the games and prizes over the last few days. My own choice, but I think ANet was wanting to circulate some platinum ... I'm clearly no economist but I get the feeling they want some gold to disappear (yeah, I know matter can't be destroyed, just transformed - yep, not a physicist either).
Furthermore, (call me a cynic) I can see a day when GW offers you more space, for a $ fee, just like new character slots. Other than to satisfy the hue and cry of many customers, I don't think they believe its in their best interest to open up a lot of free space.
Again, just my opinion, and I reserve the right to be wrong.
P.S. Just to clarify my position, I want more space (and a better way to organize my stuff).