[gruez]

>but what if suddenly lots and lots of valid user names appear?

then what are you going to do?

[cedilla]

Well that would highly depend on what I'm seeing. If it's a single user there might be an attack on the way against that user. If it's multiple users, there might have been a compromise of some credentials.

It's definitely something you need to investigate.

[sokoloff]

At a minimum, spend some of my limited time and attention on this issue rather than the 100s of other things that might be clamoring for my time.

[wbl]

What are you going to do to solve that issue?