What renowned ML collector and enthusiast started their ML collection in Henry Toledano's bookshop on San Francisco's Castro Street in 1993?  What was the title acquired on that day (and thus the first title in that illustrious collection)?

Answer:

Scot Kamins.  Dr. Kamins is a long-time ML collector, creator and editor of ModernLib, active participant in ListServ discussions, and all around funny guy.  The book purchased was William James' Varieties of Religious Experience.