I'd actually categorize the OP's comment as an attempt to attribute to incompetence rather than malice - what the Sales and Marketing folks do is, frequently if not typically, all about convincing people to spend resources they don't have on something they don't need. Sometimes it works out well for the consumer, many times it works out poorly. If we take the stance that Sales and Marketing are, in fact, smart enough, then they must just be Evil (e.g. - http://en.wikipedia.org/wiki/N...é_boycott).
I tend to agree with your assessment - the Sales and Marketing (which are two entirely different things) folks tend to be very clever. What they are not, however, is benevolent. Their god is Money, and if you don't worship as fervently as they do, then you're just another sacrifice to the cause.