If you did already buy those miners then theres no turning back as of now and no choice but to mine bitcoin since you do have already those miners.Profitability would really depend on some circumstances electricity,maintenance, location.These are the things to be considered first because you would able to compute your profits if you do deduct if from expenses but if you wont really bother for short term calculations then it should be fine if you do decide to keep those coins you mined for long term.If price of bitcoin did rise even more then it will surely pays you off.