I guess they buy their bandwidth symmetrically. Thus, as long as they have more outgoing traffic they can charge for, giving incoming away for free doesn't real

I guess they buy their bandwidth symmetrically. Thus, as long as they have more outgoing traffic they can charge for, giving incoming away for free doesn't really 'cost' them much (off-course the do lose income on this, but not real costs). It's still nice tho! :)