Someone's already exploiting the fact that you can send a tiny amount of XLTH to the same address and hope that the next block rewards you with 2 XLTH. Someone could easily spam the blockchain with transactions to and from the same address since there aren't any fees associated with the transaction.
The dev mentioned somewhere that they had fix to this problem. It was something about how the same address wont keep get the 2 coins in a short period of time.