For my part, I choose to wring my hands contemplating the single mom who has to make hard decisions about which bills she will be paying this month and which will have to wait. I won't spend much emotional energy worrying about the lower middle class teenager who feels that life is just not worth living if she is not decked out in Louis Vuitton. Apparently, your mileage varies. Whatever. Enjoy your poverty. I'm sure it will be filled with all sorts of useless crap that doesn't enhance your life and is beyond your income. Just remember, you (or the marketers you in thrall to) asked for it.
I will wring my hands for both groups. But the point you seem to be missing is that advertisers have worked to influence the subconscious. It's not a matter of you making conscious, rational decisions about what you buy. You are influenced without your knowledge. Even if you are on-guard against it (and most people aren't) you can still be manipulated. I am hyper-aware of this dynamic and even I have been sucked in.
You seem to chalk this up to weak-willed people, sure in your knowledge that you would never be influenced by advertizing. Though I don't know you, I doubt it. These people have spent almost a century refining the art of influence at a distance. It's not just ads on billboards, television, magazines and websites. They have studied the psychology of acceptance, rejection, love, want, fear, hope, envy, superiority, belonging, self-esteem, class and status. They work your feelings about who you are and your place in life. Do you know why you have to add an egg to an instant cake mix? It has nothing to do with making the cake.