As far as Vogue is concerned, the magazine is subsidized by advertising, keeping the purchase price way down in comparison to the european versions of the same magazine. And with this subject matter, fashion, the quality of the photos in the ads is more often than not MUCH better than in the editiorial section. And it's easy to see why. The mags don't pay a lot to have shots taken because the photographers will be getting such great exposure. That should be compensation enough (is what the AD will say anyway). Where as a fashion photographer shooting an ad for a client that will appear in Vogue, will run up a nice bill.
The ads don't bother me, in fact, I buy the mags mostly for the ads.