Sounds reasonable. Might also be a correlation between the stock market close (or the volatility during the day) and sales.
For affiliate stuff, if the avg payout is $200/day, I'm seeing anywhere from $50 to $450 per day in retail stuff. Revenue from tax filing packages caused some of that up till tax day. That is much more volatility than I've normally seen.
Personals are the one thing that is steady day over day and steadily increasing overall. People want to hook up no matter what. :)