Or from another perspective...

140 million tweets per day[1] / 24hr / $0.30 = 19.5million tweets per dollar.

_Surely_ there's some valuable data to be gleaned out of 20million tweets?

[1] wildly assuming Techcruch's numbers are connected with reality - http://techcrunch.com/2011/03/14/new-twitter-stats-140m-twee...

From their pricing calculator it seems the deliver max 2k tweets per hour. Way less than your 6 million, and not that useful.