I drew this in around 2010. It’s just ordinary pencil on paper.
A few years later I saw some guy had printed it off from the website, brought it to a Russell Brand gig to get it autographed, and then sold the signed print on eBay.
Part of me had to admire this.
I could start doing it myself. Buy a ticket. Draw the performer. Get the drawing signed and re-coup the cost of the ticket.