Art Hoarders or Collectors?

Filmmaker Megumi Sasaki has made a documentary about Herb and Dorothy Vogel, art collectors who have amassed over 2,ooo works of art in their lifetime on postal clerk's salary. The focus of the majority of their purchases have been of minimalist or conceptual works. This looks really interesting and I am glad for collectors....but....I'd call it hoarding. Some folks hoard food, some cats, some clothes. The Vogels obviously hoard art. What is the point of buying art that is put away in stacks of boxes or shoved under beds?

See the trailer here.