I dont know where groupon gets all its money from, but whenever i look at my site these days, i see ads for groupon, groupon, groupon, groupon, groupon and groupon. text ads AND images ads too. so wherever there is an ad, there is groupon. even in my dreams, i see groupon.
and i end up with that stupid thing where one ad occupies all four spots -- resulting in tonnes of whitespace around one ad and it just looks silly. so i want to block them. but i suppose the ads must convert well, or they wouldn't be there.
have you got fed up with groupon and blocked them?