So far as I understand it one uses Safecoin to buy storage space but earns it for Apps used and providing storage space. If the currency is convertible to other currencies won’t it be vulnerable to speculation?
The amount of Safecoin in circulation could be drastically reduced by this speculation causing changes in prices due to money supply changes.
Yes in the future when Safecoin (or what the name will be) is created, as Neo wrote, you buy storage. The coin can be earned by farming, reward for developed apps or you by them on a exchange.
The coin will will be priced by markets supply/demand. The total amount of coin will be balanced to be able to pay farmers. The Network will also balance reward to farmers from what space is available on the Network, high spare space = lower reward, low spare space = higher reward.
As the coin price will be dependent on supply/demand, speculation will occur.