Looking at the blockchain pool stats for the today's total mined bitcoins and earning from the transaction fees. Around 25 % earning of miners come from the transaction fees , so if you are mining with your rigs then minimum of 25 % transaction fees , you have to pay to the transaction of pool. Apart from that your hardware cost , electricity cost and cooling maintenance would cost you extra 20 to 30 % , so at the end of the day you would be able to make around 50 to 55 % of earning from the minings.
Which is still very less as initially you have to put lot of money to run your own rigs or if you are planning for cloud mining then your earning would be around 50 % of the mined bitcoin.
Bitcoin core team should do something to reduce the transaction cost and making mining much more feasible and profitable so as to more and more investor would look into it as an lucrative investment option.
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