I'm saying that, based on past writings of mainstream comics, Millar enjoys throwing some fanwank into his work, yes.
Fair enough. Although, I would be curious as to hear some examples from you concerning Millar. He's nowhere near perfect. But, I've never ranked him in the category of Johns & Co.
In fact, if pressed, I'd go so far as to say that stories about heroes' last adventures, imaginary futures, etc., with nostalgic nods and/or gags involving obscure bits of continuity and "where are they now" cameos of how the writer wishes the characters would end up are often a form of fanwank.
Possibly. But, I find it hard to accept that definition without lumping in every possible future story ever. But, I think that's over-stating the concept, really.
I'm also saying, as noted above, that I think some people overuse the term fanwank when what they really mean is "material I do not, myself, enjoy."
I wouldn't neccessarily disagree here. But, I think there's a defining line to successfully demonstrate a difference, though...