I totally agree with you. I would love to keep adding items to my gallery and I do but I am have be thinking maybe I should delete some of the categories and sell off the items to give me more space. Its a shame you pay so much and the amount of space you get doesnt increase with the cost of space. I would like to have galleries on my side accounts but dont for the reasons you stated.
Gallery Size
Your gallery is currently size 1048 (10480 sq ft. of floorspace). This means that it can hold 5240 items for display. If you would like to purchase some more room to place items in, then please press the upgrade button below.