Str82u - 2:10 am on Apr 14, 2013 (gmt 0)
Oh yes they do.
Google doesn't know that ;)
Can you say how you mean that? Do you mean that most SEOs one would hire are going to make it obvious what they are doing?
I never bought links for any site but still get that funny feeling that there is a slight amount of "confession" built into the Disavow tool, like the webmaster is telling G "Maybe you should have a closer look at this site" in the same way that if we all spilled out links to our best sites then checked each other, we could probably find something to call spammy.