To put some numbers to the statement Mike just made, I went back and looked at two pages of threads in each of the three Gun Show forums. In those few pages there were 22 threads deleted because the poster failed to include their location.
It's a simple rule, and easy to fix if you do make a mistake. The problem is that quite a few don't bother to read the rules, and if they have, they don't bother to proof read their threads, or they don't bother correcting them if they do spot an error. To be honest, we have very little compassion for any of those traits.