I am not calculating thi too well but
30H/s in morenro at +30 watts would give you:
1,5 $ revenue per month
-3$ electricity cost
= - (minus) 1,5$ per month
120H in monero at +60 watts woudl give you
5,7 $ revenue per month
- 7,3$ electricity cost
= - (minus) 1,6 $ per month
IF my calculations are correct becasue i didnt tested how mining cpu will increase wattage, those are my numbers taken from head and not backed up by any experiments.
Either way its totally not profitable to mine for you.
Even it would be totally unprofitable to pay me fee in this way but if someone has free power or doesnt care, or cant pay via btc then this is the way to go.
Tell me how do you see/calculate this ?
Note that idle procesor takes much less watts tna 100% busy one
Its not "free"
And also as
pbuva said there are some issues with loading cpu.
Thats why i just need to do some tests if it will make any sense for me and for end user. (and propably it wont)