It is just experiment/test so what is funny in my counting..

It would help to know what exactly it is that you're "counting". Those are clearly not scrypt.cc numbers because you didn't include regular reward "halving" into your calculation, not to mention withdrawal throttling, auto-reinvest, etc.
I turn off auto-reinvest and i count 0.001 fee for withdrawal. But i don't know what mean "regular reward halving"?
Auto reinvest sometimes admin turn your setting "on" also if you don't want, normally just before reject your witdhraw and turning your funds to you account, so they are suched back buying Mhs...
"regular reward having" is that the admin every week cut the reward you earn every 10 minutes from your Mhs.....
Good Luck LOL
I hope now he got why I said:
ROI

LOL
because you are not going to roi at all, you just lost your coins... Well, you gave them as a gift to the admin of this shithole