Once the RICO is over, minting will only be available to masternodes (you must have 8 000 000 XAURs to qualify for that), mining, buying and selling of XAUR will be available.
8 000 000 XAURs for running a Masternode? Isnt that a bit much?
The total supply is just about ~50 million currently.I don't know if they're gonna change that ...
According to http://www.xaurum.org/mint.html, a masternode should have 1000 XAUs (8 000 000 XAURs after the RICO) and yes that's 7 masternodes for the available supply (7487 XAUs).