Lee Gomes writes in today's Wall Street that cookbook publishers think we are too stupid to purchase cookbooks that include ingredient weights as well as volume measures. At least that's his conspiracy theory: "if you don't have (a digital scale) in your home, it's another victory for the small cabal that suppresses these devices every way it can." Apparently cookbook publishers think that weights in recipes are too daunting and they want to keep things simple.
He writes that highly accurate digital scales can be had for as low as $30 thanks to the Chinese manufacturing boom and cheaper computer chips.
Good article, wish I could provide a link but I don't subscribe to WSJ online and couldn't locate the article on the free part of the site.