People would place fictitious addesses anyway...
Tis true..
I've been a moderator/administrator on a couple forums over the years and while I've never forced it, I've requested it in the initial email and PM to new members. I even told them it was in an effort to eliminate spammers, but some people just don't want to give out the information..
About 1% of them make more than 3 posts before never being heard from again. The 1% guy has made it part of his schtick, claiming to be a NSA agent or something. Of course if you look at the IP address of most of the posts you'll know exactly where he's from, anyway.
I always post my general area, but I'll need to know someone personally to give them the actual town.
And I'm located on the IL/WI stateline, halfway between the big lake and the big river.
But if moderators look at my posting IP address they'll see that I wander a fair amount.. I repair paper making machines all over the US, so I travel for work almost every week.. I'll be in Savannah, GA later this week, and through the weekend, and then in Macon, GA next week before wandering back home.