Way too much, also
I notice the Pupsi sketch auction says it was painted with acrylics while another auction says a sketch was done with, "Micron black pen and Prismacolor markers".
I'm assuming the color was added using markers?
Yes, for the Ajerx sketch I roughed it in with light pencil first, then darkened the outlines with Micron pens, which are permanent ink. After the black lines dried I layered in color with the Prismacolor markers... which are not top of the line I guess, but they blend OK. They often bleed through to the back of the card though.
I drew a black and white Ajerx similar to it (only one) or the pack-inserted sketches.