There are very few (if any) magazines that are profitable based on newsstand and subscription sales. Without advertising, they wouldn't exist.
Most people think the reader is the customer. The way I look at it, the advertiser is the customer and the reader is merely the "product" that the magazine delivers, just as in broadcast television, the viewer is the product.
This isn't meant to condone the actions of the shady advertisers, merely to explain why complaints to the publisher won't affect the magazine's policies. If they saw some significant drop in circulation that could be tied to their acceptance of ads from certain advertisers, then they would be more inclined to drop those advertisers.