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I receive a lot of suggestions to increase inventory space or make inventory unlimited, but it is impossible to possess every single item (which is increasing constantly through updates) on a single character. Please understand that this is physically impossible, because there is a cost related limit to server storage (the location where everybody’s character data is stored). In order to increase stored data, (tens of thousands of characters x numbers of items x bytes of each item) there is no other option but to increase hard drive size. Basically, charging fees for additional storage options exists to combat this issue.
Even for stand-alone package games, the size of the save data is greatly affected by the number of items, so the numbers of items and the size of each item are determined by available server space.