If it was ridiculously expensive for their own and cheaper on mine, or if the insurance benefits were crappy or virtually nonexistent through an employer? Yes we would. Just because someone has a good job also does not mean that they will have better insurance through that employer - or any insurance option at all. And private insurance can and does cost more money than a college kid or a person just starting out in their career (a modest income career) would most likely be able to afford on their own in some states (like mine - it's really nice being told you'd have to pay more than your monthly mortgage for private insurance! ahem)

Anyway, yes, absolutely, I would. But I also don't believe that I have to stop helping my kids once they hit a "magical" age of 18 or 21 either. In my family, we take care of family - financially, physically or otherwise. It was the way I was raised, it's the way I'll raise my kids. DH was raised the same way. Would we automatically do it? No, but if the circumstances call for it (ie it was cheaper or better plans or whatever, if the benefits outweighed any cons) than yes we would have our adult children on our plan. But that's just us and I realize other families work differently.