[dabeeeenster]

In London a Ping Pong table would cost around £10k/year in floorspace used.

[runholm]

A company often spend some floor space on areas where employees can take a break from work to disconnect for a few minutes. Why not put a ping pong table there?

[jon-wood]

Because it then stops being a space where people can take a break, and becomes a space where two people are playing ping pong, with everyone else crammed along the wall.