Right now the coin's not worth buying because the POS reward is less than 2% PA (a fraction of the 10% advertised on the OP).
If the devs want bounties I suggest they fix this and include (like Supercoin) an option to donate a percentage of the stake rewards in the next issue of the wallet. I invest in a range of POS coins and I'm more than happy to donate a portion of my return, just as I used to do with mining.
But there has to be a reasonable return.