Well people can become a lolcow by their own volition, it's just that when they do it usually isn't in the way they want or expect.
The sort of pink triangle behavior we're seeing is still embarrassing behavior, only not the kind that they think it is because they assume everyone is way stupider than they really are and think they're the first person to try it.
The thing is if someone was interesting enough to willingly be entertaining and gain notoriety in a way they plan, then they'd just be an entertaining person and wouldn't have to try so hard at it. They could just post normally and people could read their post history if they wanted rather than deliberately shoving themselves into the middle of the floor for the sake of it.
That's the entire point of a lolcow; they're people who have latent entertainment or educational value, they just need a little assistance to bring it out.