I think that came about before we had weight limits. There is something to be said for keeping the stacks set at 99 in the storage chest to prevent people from storing way too much of the same thing (e.g. stockpiling 10,000 Healing Potions and crashing the market)…but certainly it might be worth increasing it past 99. We will talk about that internally. We are planning on having a feature to increase the size of the storage chest as well soon.