What hackers will not do is sit someone down and collect forum names by hand off of a forum.
Before: Hackers had to hack WoW or some other game's database to get a list of user id's. Relatively hard to do.
Now: All they have to do is write a web crawler / script to collect user names from the forums. There are even pre-mades out there. It's not even illegal
to collect information from public websites.
Nobody sits someone down, how dumb is that? There are scripts available on the internet. Legal scripts.