> It's not as expensive as the actual wars we are fighting, but it's not too far off either.
It's not that much different as people may think. What the real arms race and marketing have in common, is that they're at their essence a bare, exposed* positive feedback loop. Marketing done right seeks to cancel itself out; if two competing companies do their marketing in an optimal way, it will leave the customer in the same state as if no marketing effort ever occured (ok, maybe a little more tired from listening to all that crap, but otherwise his/her decisions will not be influenced). In doing so, it can in principle use up (i.e. waste) unbounded amount of resources. That's why I sincerely consider marketing to be a parasite and a plague of our times.
You know one other thing that work in the same way? Political campaigns. Each year each side hogs up more and more resources for their campaign, but done right, they just cancel each other out, ending up providing zero value for all the resources^ wasted.
So yes, I strongly believe we have a problem here.
* - think about looking at a bare, exposed core of a working nuclear reactor. Not fun.
^ - I keep using word "resources" instead of "money", because the latter invokes some weird brain failure modes in people, that make them think there's no problem here. Positive feedback loops like those don't waste abstract numbers, they waste energy, fuel, mined resources, paper, human time and human lives, and screw up our planet even more than it is already.