LitecoinDark is no longer profitable after they reduced block reward drastically. It was very profitable though. CleverMining has been mining LTCD since beginning of September and we mined ~33% of total LTCD supply (which is huge). But today LTCD profitability is at ~60% LTC. We definitely keep our fingers on the pulse and we usually add new coins days or even weeks before other pools (we've been the only coin-switch pool mining LTCD for few weeks before other pools joined the party).