C’mon buddy, we all know it is not just going to be just 20 people buying for package. 
By looking at previous sales it will be more like:
30 hours of work x $20 per hour = $600 payout from one client
2000 clients x $20 per sale = $40000 payout from two thousand clients
Just to make people aware what the number in questions here are.
And why you can NOT compare to industry salary or any hourly basis.