An idea just come up to my mind - what if we made the prices a little variable, increasing each month and also increasing the sell price with more sold items and decreasing the buy price with increasing amount of sold items. It would make game more interesting and feeling a little more realistic, while not much changing the gameplay. Just that if you decide to empty your warehouse and sell those 3000 alien alloys, 500 elerium and 50 mind probes, it will be unprofitable than selling a few after each mission.
Well... it's just a thought and probably and idea for mod than for default gameplay (since it could change it too much for someone), but think of it please
