Wired figures that if you read any of their content at all you owe them $50 / year and that's an 'all you can eat' figure. So if you read all the articles they have that's a bargain, if you read only one then you might as well skip that one and the next and take your s.o. out for dinner.
A micropayment system would reduce the need for such calculations, it would allow a pay-as-you-go model which is far more effective for impulse buys such as articles.