That's not what you said, let me refresh your memory:
Searching and disposable income aren't mutually inclusive.
The poor people may be spending even more time searching to find bargains that let their income go further, such as on craigslist, ebay, sales on amazon, etc.
As a matter of fact, there are a ton of sites set up that cater to the coupon hounds and frugal shoppers.
Still, what has any of this got to do with the topic of "Yahoo Says Google Ad Deal Complies With The Law"?
I don't think Google selling ads in combination with Yahoo is overstepping until Yahoo completely replaces their ad platform with Google, that's when the anti-trust action should get involved.