For me it's probably selfishness. I'm an infinite inboxer, who prefers synchronous communication (if any). If I need something, I'm going to walk up or call, an

For me it's probably selfishness. I'm an infinite inboxer, who prefers synchronous communication (if any). If I need something, I'm going to walk up or call, and yet my door stays closed. So the two preferences aren't mutually exclusive, but in my experience these generally ARE different people altogether.