I'm a sceptic by nature who doesn't take so kindly to conspiracy theories). This in no way means I have to be a resources hog and mindlessly buy the first shiny things I see.
Secondly, it's a vile game of status. You buy things you don't need (or things you do need that are hideously fancy and expensive) for ridiculous prices to gain the approval of your peers, since you can afford to spend that much money. That's about it. Since I don't like games of status, I don't like my peers, and I don't like buying overpriced shit I don't even like in order to raise my status with my peers, I see no reason to take part.
I've saved the worst till last: recreational shopping is one huge waste of resources. I think people know this on some level, since the whole point is to shop for things you don't actually need, which requires using resources to make, transport and house all these things nobody really has any use for. I don't think it registers, though, just what we could be using all this space and materials for. At least, I'm hoping it doesn't register, because the alternative - that people know they're wasting resources on buying shiny shiny things and don't care - means that people are being stupid and evil instead of just being plain stupid, and my perception of humanity is already rocketing towards the event horizon of a black hole. I don't need it to cross the event horizon.
I think I may have already written an article about why I oppose consumerism, but I'd like to add something else here. We stroll around the high streets and the shops that could be converted into so many rooms for people to live in, looking for shoes no-one can walk in and clothes we barely ever wear. We don't need these shops. We don't need to raze land to the ground to build them. We need to find homes for those who have none and we need to protect what's left of the environment, and that would be a hell of an easier job without giant shops selling pointless shit and sullying the skyline.