Interesting idea. I don't think I'd have an issue with nursing someone else's child, but, yeah- the time demand would be too much for me to reasonably consider. I did give milk to a friend for a time while she was struggling with supply issues and using a supplemental nursing system. I just pumped whatever side DS was not on and saved all the milk for her. That's probably as close as I'd be willing to come to wet nursing, though.