0.6 DBIX/day with 230 MH/s sounds more or less normal, the difficulty raised in the past 4 days from 90 to 160 due to heavy mining and also mining farms which jumped on the train (with more than 1 TH/s while the whole network was just on 1/TH at this time or even less).
maybe check ethminer 0.11.0 if that gives you slightly more performance.
in my opinion it's still worth to mine that coin at this outcome and hole for some days/weeks to sell with good profit
