hannamyluv - 8:34 pm on Mar 8, 2013 (gmt 0)
so I can see where he might want to make them look bigger with large font
I took the larger font to mean he was trying to appeal to an older audience (which translates to a more monied audience).
His layout and style seems to follow the very best practices when appealing to a 50+ audience. Boomers, despite the recession, are flush with money right now. In appealing to them, you would get an audience that is more likely to convert on high end purchases, much more likely to have been through the car buying process several times and therefore more open to avoiding the hassels of the car buying process and therefore more likely to purchase the services that dominate his ads, and are more likely to be actually looking for a car they mean to purchase, rather than just fantasy window shopping.
Alot of times people talk about the ads and their placement as a way to increase money, but people might want to think about their audience and how to appeal to the part of the audience most likely to convert for the products advertised on their site. Cater to those people to attract them, and your ads become more valuable and your adsense income goes up.