Unless your website is well established, has lots of visitors and brings value to users you should not use Ads by Google.
The ads were design to monetize trafic not to be used by anyone who has an website or a blog. It makes sense for a newspaper site like News and Observer or a TV Station website like WRAL TV, websites that bring value, with thousands of hits every day, to have Ads by Google but for a blog or a personal website with 10 visitors each day it doesn’t make any sense.
I don’t know what people are thinking but it just not worth to annoy your visitors and break your design with Ads by Google for 50 cents at every three days – and this is lucky.
I don’t know what Google is thinking letting sites with less that 500 hits per day having Ads by Google. It poorly reflects on their business model.