I think that those that are against CC (in all its various forms) are probably lucky enough to have a co-operative baby.
Depends what you call a co-operative baby. I think that kind of comment diminishes the efforts that go into gentle parenting. But if it makes people who have used CC feel better to believe that gentle parents have babies that sleep anyway, then *shrug*.

I haven't had a full nights sleep for 14 months now, especially lately - he's been waking like a newborn every couple of hours. I wouldn't call that co-operative.

I don't think it's selfish at all to be using gentle methods. I agree with a previous poster that it feels the opposite to me, especially in the early days, that it would be selfish to try and fit a baby into a routine that YOU want rather than what the baby needs.