At A Working Library, Mandy is afraid that we are victims of a kind of Gresham’s Law of web content and advertising.
There is no end to this, in that short of eviscerating the content all together (and removing any impetus the reader might have to visit in the first place), our attention to the advertisements is always waning. Sadly, our attention elsewhere also suffers and declines; instead of staying still to read, we skitter from place to place, like frightened prey assured the predators are near.
(Incidentally, I suspect I could save everyone some time if I just point at A Working Library and gesticulate madly. Go. Just go.)