This is a genuine question LJ.
£150 for a T shirt with the badge on the arm, or £350 for a sweatshirt similar.
I accept the fabric innovation and unique colours argument at the top end of their clothing, but seriously do you "get" £150 T shirts?
Surely they are simply there to lure in to the brand people who can't afford the really innovative clothing they seem to make (that I wasn't really aware of), without tarnishing the top end?
Like hiring a car on holiday you could never afford to buy at home.
Of course there's some stuff that's pretty boring and simply a plain t-shirt with a badge on, or whatever, and V_A_N can probably articulate this much better than I can, but this is no different to any luxury brand that typically uses the diffusion lines (or even cosmetics, fragrances glasses etc) as a way to keep a sustainable business, whilst exploring their more experimental and top end lines which they'll sell in much smaller numbers and for a higher price.
People want to "buy into" the label and be seen to wear something with that brand, and so are willing to stump up £150 for a t-shirt if it means they can say they wear a particular label even though they can't afford the top end items. No different from say BMW making 1 series' or M sport body kits cars, for people who can't afford a 7 series or the M series engine but want to own a BMW.
Also as someone else has said there's a lot of fake stuff doing the rounds, particularly Moncler, Canada Goose and SI.