As someone who has experienced the fallout firsthand from a neighboring tenant in a downtown Seattle office building who used it, I'd challenge the idea that there are valid reasons to do this.
If you control the physical network - don't allow rogue APs on your network.
If you control the client and care about them connecting to access points that aren't under your control, then manage that instead.
http://www.cisco.com/c/en/us/support/docs/wireless-mobility/...
As someone who has experienced the fallout firsthand from a neighboring tenant in a downtown Seattle office building who used it, I'd challenge the idea that there are valid reasons to do this.
If you control the physical network - don't allow rogue APs on your network.
If you control the client and care about them connecting to access points that aren't under your control, then manage that instead.