$2,000 with $0 in expenses... maybe "cash cow" isn't the correct term but it's definitely not too shabby for something that was set up in 5 minutes ;)

Investing 20 hours for $100 "self earned cash" on an own project feels somehow better than working 2 hours on a strangers project for $100.

"$0 in expenses", he has to put work in it. I would define any labor to be an expense. It is definitely not "free" money.

I'm putting these together Sat/Sun morning while I sip my coffee. It's as close to free as it can be.

How much time do you put in into each edition (or during a month) on average?

1-2 hours per edition.

The expense was the labor!

Damn right!