Actually, probably not. Some companies have already been caught with their hands in the cookie jar, sued, and settled. See eg [1]. I'd bet most companies have looked at that and decided not to do anything similar.

Note: I'm an actual quantcast employee, though I started after the aforementioned behavior. I'm not speaking for quantcast. (Seriously -- don't be a dbag and quote this as qc's position or anything. Because if you want qc's position ask our spokesperson.)

[1] http://www.wired.com/epicenter/2010/12/zombie-cookie-settlem...