My favorite supplement of all time was AC9, Creature Catalogue, and my second-favorite was AC10, Bestiary of Giants and Dragons. Neither of them made the list for some reason (grumble grumble), so I was upvoting the only BECM supplement that did (Shady Dragon Inn, somehow). Now it's gone, so there's really nothing left for me to upvote on purpose. Guess I'll roll a d4...
And I'm downvoting VGtM for its price tag alone.
Encyclopedia Magica (2e)--18
Creative Campaigning (2e)--16+1=17
Campaign Sourcebook and Catacomb Guide (2e)--18+1=19 Rolled a 3.
Complete Guide to Villains (2e)-- 8
Volo's Guide to Monsters (5e)--19-2=17 Fifty bucks? Seriously?