If you can generate $1,000 from $20 to $35 service charge, Why share the 99% of earnings. you should be a millionaire now if you can flip $20 to $1,000 in one month. Just Sayin 
The service charge is to show interested people what works in self-publishing, they will have to work themselves to start earning $100, $200, $500, or $1000. I'm not flipping $20 for $1000 in one month.
It will take about two months to start earning $1000 depending on the amount of work the person puts in.
Quoting from my main post;
"How long will it take for me to start making $1000 a month?
Two months - if you are determined.
But if you don't meet your target of $1000, and you make $500, that's not bad, I guess."