AbigailII: While this site has a small clientele the overlap of IP addresses is reasonably unlikely to occur (eg. 600 UK registrations, a mere 70 for Italy). Agreed, when we have hordes of people all from the same source then IP address distinctiveness becomes more tenuous.
IP address as an indicator of personality? Lol. I usually use behaviour for that ... sometimes foot size ... maybe house number . . . but never IP address. ;-p