If you're going to a comedy club in your city and seeing a person headline that you don't know that well, he's probably making between $1500-$3000 a week. The person going on before the headliner is probably making between $500-$1000 a week. The person MCing probably $300-$500 a week. If you go to a special event with a name that's a household name, you can probably figure out how much they're making by looking at how much you paid for the ticket and the people in the room, and normally the artist is making 50% of that gross, up to 100% depending on their pull. It the tickets are $25 apiece and 300 people in the room, you're talking about $7500 for that show. 6 Shows, about $40-$45K coming in. Chances are a headliner of that nature could make $20K or even up to $50-$60K that week, maybe more. That's usually how it works.
...and gives his advice on finding a manager (hint: don't).
Don't worry about finding a manager. When you're doing the right thing, when your comedy is undeniable, when you go to your home comedy club ten times in a row and you have the best set of the night by a landslide every, single, time and every bartender, every waitress, every manager, every comedian that hates you, every audience member if they had a truth serum in their veins would say you had the best set of the night. If you can figure that out, and do the kind of comedy that you love, embody the kind of material that blows you the fuck away when you watch it, when that starts happening, managers like me will chase you like your ass is on fire. But until then, keep working hard, keep doing the right thing and don't lose faith in yourself. You will prevail.
Katz also has a podcast where he interviews industry types.