I know Cheapy and Wombat wanted more people to talk about the A/B/C/D rating of Internet celebrities. The problem is that fans and casual observers do not define these lists. There are actual lists put out by Hollywood talent agencies that categorize celebrities based on their marketability.

An A list celebrity is someone who is attractive, experienced, well-known, easy to publicize, eloquent, great during interviews, etc. A B list celebrity is one or two attributes removed from an A-Lister and C-Lister 3-4 steps away from an A-Lister. A D-Lister is not easily marketed.

I'm not that hip on Internet celebrities but I'll try to grade the CAGcasters accordingly.

CheapyD - B-list.
Moderately recognized, fairly attractive, experienced/trusted, interviews well.

Shipwreck - C-list.
Lacks recognition, fairly attractive, experienced/trusted, eloquent, interviews well.

Wombat - D-list.
Lacks recognition, polarizing figure, not always appropriate. (Truth be told, I respect wombat, he's just not very marketable)

My understanding of the celebrity grading system comes from Horace Dediu on the podcast The Critical Path, episode "Below the (belt)line"