Have you ever wondered what’s up with that MVP Supreme store at Westfield Montgomery mall? As any teen can probably tell you, the store is a reseller of Supreme and other popular skatewear brands that produce high-priced goods ($78 T-shirts and $158 track jackets) in very, very small quantities. The scarcity means that most items get snatched up the moment they “drop,” and some Supreme stores have set up ticketing systems to handle the overload of shoppers on “drop days.” As for the lucky buyers, they’re less likely to wear their Supreme clothes than to resell them — at school or online — for a sizable profit.