spose
suppose you have a $1 million portfolio. and it earns 10%. you can live pretty comfortably on the interest of $100k. inevitably you kick the bucket and your two kids get your doh. they each want to live they way you lived. so they withdraw the $100k interest plus another $100k of the principle. no biggie. they kick the bucket and your four grandkids want to live they way you did. so they take the $90k interest and another $310k. your portfolio is down to $590k. your great grandkids want $800k. but there's only $649k. so they kill each other and your great great grandkids get nothing. now suppose you have a planet...