I'll take some blogger leeway here and expand on a WebmasterWorld thread named Google's way to say "Thank You" in the AdSense forum. Basically what this particular member noticed was an increase in earnings per click on his birthday and on thanksgiving. Specifically;
the day before my birthday --> + 94% compared to the two weeks average before and after that day!
Thanksgiving so far --> + 80% compared to the two weeks before Thanksgiving
Now of course this is ridiculous but if you have read The Search you would think twice. Yes, this is most likely not happening now but can/will it happen? Yes it can.
Why can not Google give you a higher percentage of the pie, on special days? Why not? Would it make for good marketing? Would users love Google if they offered up special discounts on products on the week of their birthday? Would publishers love a higher EPC on special days? Hey some states offer tax free days? Tons of retailers have holiday sales. The future of search...