I think it's all about your perspective. In all honesty, most ppl. don't necessarily only work to just "make ends meet." They work to make their ends meets (just like Kate) but in all honesty, most ppl. that are "part time parents" don't necessarily have to be. They're doing it to make their ends meet, and what they've come acustom to as their way of life (just like Kate.) Sure right now, they make a lot of money
(also have a lot more expenses than I do,) but Kate's not stupid, she knows none of it will last for ever, and I'm willing to bet the show ends long before her speaking engagements, book writing ect. It's all in perspective. I don't think there's anyway that if they quit the show right now and the speaking (or even just one of them) that they'd be able to keep the lifestyle they have right now (just like me or other ppl., just for me on a smaller scale

.) Almost everyone can live more modestly than they are, but they and Kate choose not to for a number of reasons, and I don't think it makes them love their kids any less, I think most if not all do it for their kids. Don't get me wrong, as an outsider looking in, I can say they may need to take a break for a while (although really I have no idea what things are like at home ect.) but I think to say that Kate's only doing these things for herself, is blantantly incorrect, at least as I've always seen things when watching the show and following their story.