izzy yes dear, mummy here 
you are absolutely right, I'm sure there are benefits beyond 6 months, but no, I don't think bf is for poor countries, I was just wondering about statistics!
DD is our 6th, so I thought I'd stop after 3 months due to being very busy, but somehow carried on - probably for not having any reasons to stop, rather wanting to carry on, IYSWIM. (although I'm getting quite emotional about stopping this time so I'm delaying it...)
with the boys I stopped at different times for different reasons (longest 9 months, shortest 3 months), but I probably would have carried on for longer if it wasn't for them getting bored, biting, pulling, undiagnosed tongue-tie (and weight loss issues, therefore bullied into ff, when they should have looked in his mouth first, just ridiculous!) and being just so busy & stressed it didn't work etc.
I love bf, but have no regrets for stopping with each child when I did (apart from the tongue-tie one, still fuming about incompetence of HV, DS8 is now 8)