It's not "wrong" for them to place ads wherever they want. It's just not something you like, and it's their decision whether to consider the opinions of users in the matter. It might be stupid to ignore the complaints, but it's their site.
The fact that you've subscribed now would seem to validate their opinion though. I don't know either how many people might have left, but how many instead made the decision to subscribe? How many others just deal with the ads? How many are filtering them out, and had already been filtering so it doesn't make any difference? I subscribed (partly for the ads, partly to see if it's any faster, which it's not, and partly because the site's code screws up the preservation of text entries if you click a link and are using proxomitron).
That's two people. How many more?