This is really only usefull in my home environment. As anybody can request a static IP without accessing router. BUT nobody in my house WILL do that! This allows me to easily block any device I havn't given static IPs to. (non of my devices obviously) I prefer IP based Allow/Deny with SMB especially @ home because the alternative is a linux daemon authorizing windows credentials and I find that much more complicated then setting the DHCP pool on my router to 192.168.1.1-127!
OR for Public
PS: The hosts allow overrides the host deny.