I do not use the speed potions, and consider them a waste. I should be able to sell them if I choose not to use them. Maybe just get gold or special stones such as ruby or amethysts for the bigger ones (like a week).
Also, it would be nice if I could buy some of the special event items like the Fingerprints in the Detective Stories 4. Quite often, I am left with a few of them because I want to buy the better items, but it doesn't add up to the max amount of the item. Maybe for the Green Gems or gold and energy.
