These comics remind me of the wisdom of Will Rogers, the early 20th century cowboy-columnist. "Too many people spend money they haven't earned, to buy things they don't want, to impress people they don't like."
And if you're actually spending money you have earned to buy useless stuff- that's even crazier. A gulliblity check is in order. You're not that naive. What besides the cowl-induced sploin-built krypton converter and the hardpoint quadraphonic ion-inverted tesselator do you not want?
Ask yourself one question. What need does this purchase satisfy? An honest answer might protect you from being easy prey. If there is a genuine, demonstrable need, forge ahead. If the satisfaction is purely emotional, It might be a want rather than a need. If polishing your reputation as a trend setter, style maker, or early adopter is your best excuse, proceed with caution. Not every want needs to be satisfied.
Even cave merchants knew the power of branding and marketing. Unique gifts or useless junk? Another good question. If the cave consumer has it figured out, we can too.