Intelligent people ask intelligent questions.
Indeed it is true that if a particular setup can profit $2 per day there is seemingly no sensible reason to lease it out for $1 a day when you could have the $2 a day yourself - it would make more economic sense to lease it out for $3 a day.
From another perspective, someone who wants to mine can forgo the initial outlay for mining equipment and hire mining power for a fee. It is possibly not true, also considering the cost of running the machine, that leasing mining power may be more cost effective than purchasing and housing mining equipment yourself - most high-power mining equipment is also quite loud. It is still to consider that the equipment you lease may have lower costs for power and cooling than you could provide.
3I think you've answered your own question... – chytrik – 2018-06-29T23:34:30.993