I had a friend in high school (1969-1972) whose father already had an enormous collection. Practically every book shelve in his house was full of comic books. I was told the father never bought a comic book addition to his collection that was worth less than five dollars, at the time. Some he kept in a vault. I believe the collection is now housed at the University of Florida. A lot of fun thumbing through that collection back then.
THAT is a collection! Massive fun.