Exploiting the lack of information _is_ overcoming the lack of information.
It might not be the most efficient net outcome, as a better solution might otherwise exist, but if there is an exploitable lack of information that is exploited then by definition the information in the system has increased.
Only if we believe that "exploiting a lack of information" necessarily involves increasing true (and useful) information in the system. I certainly don't believe that's true, much less "by definition".
Marketing (in its current form) does not attempt to overcome a lack of information. It exploits the lack of information.
See: The consumer driven debt-march of the American people.
"When I walk past a shop, I am amazed at all the things that man can do without"