On the one hand, even good coins have highs and lows, pump and dump periods.

On the other hand, the unit of acount is on the low side (like coins such as mintcoin for instance : when you have total number of coins in few years more than the 10 billion range) : when the price is low it can go down to the 10 sat range. In this situation you have 10% difference at least between bid and ask for most exchage where the smallest unit of price is a satoshi, which is not healthy (for mintcoin there was some days when price was 1 satoshi : traders can manipulate the price and have huge profits : 100% difference between bid and ask!).

To my opinion, before sia became highly used and popular (therefore with a high price), it would be better to have exchange price in kilo sia instead of sia : with current price it would be around 10000 sat for a ksia : you will have a minimum difference of 1/10000 between bid and ask instead of 1/10!