celgins - 2:06 pm on May 2, 2009 (gmt 0)

I think Adsense earnings were higher years ago because:

1. Fewer publishers were in the system.

2. Changes to the SmartPricing algo have decrease some publisher earnings.

3. Ad quality restrictions and landing page restrictions have disrupted some advertisers.

4. The world economy was stronger than it is now.

5. Ad blindness had not begun, but it has now.