Forum Moderators: martinibuster
The reason why, is you need to see from the beginning how your site is targeting. Waiting until you have a lot of visitors, and then throwing AS on the site, it's not that it seems tacky, but it can be a little jarring, and you might have several days of non-targeted ads OR even worse, you are going to find AS focusing on keywords that you don't want it focusing on.
Better to have it as soon as possible so that you know how the targeting is doing, and if you need to make tweaks (better at the start than having to go back and change dozens or hundreds of pages).