There are lots of costs involved in having ads. You have to pay someone to sell them, the advertiser has to pay someone to buy them (believe it or not, media buyers and ad agencies take huge percentages), and they're difficult to sell against audiences of less than millions. More importantly though, we value your time. Take a look at this calculation - if you make $10 an hour, even watching one ad-supported TV show regularly costs you about ten bucks a month of your time. We don't want to put you through that, so we try our best to keep it to two ads per episode.