when they announced they were delisting TRC (end november/december 2013) the trc price achieved its all time record, reaching USD 1.3 per TRC (BTC was traded at 1 kUSD at that time) and volumes went crazy, so were btc-e profits then i guess.

As someone said above, keeping it live should not cost them that much, 2 to 8 BTC volume per day still grants them some daily incomes ; time will tell, but TRC is still quite young - 1.5 to 2 years i think