Can you imagine pitching this sort of 'perks' to professionals in science, medicine, or engineering?
[follow up from another HN link ;)]:
"... to provide for their care and feeding. It is probably no accident that the relationship between dogs and their owners mirrors the attachment relationship between parents and their children, behaviorally and physiologically."
These things have become a joke -- I guess because they are so common in SF -- but damn, for a single person who doesn't like cooking or taking long lunches, and likes ping pong, these things are pretty damn cool.