Nike Sneakers sell roughly 1,899 units a week across the five main EU Vinted markets, with Nike averaging about €22 per sale. That is real, current demand — whether an individual item is worth buying depends on its condition, size and the price you pay.
Category demand tells you people are buying. It doesn't tell you whether this item, in this size, at this price, will make you money. Three things decide that: the buy-below price (the most you can pay and still profit after fees), the sell-through rate for the specific model, and whether the size is one that actually moves.
A strong category with the wrong size is still dead stock. That is why per-size demand matters as much as brand demand.
Look up the exact model rather than the category. Resale IQ returns a BUY / WATCH / SKIP verdict with the buy-below price, typical sale price, sell-through rate and the sizes that sell fastest — computed from 30M+ listings across Spain, France, Germany, Italy and Portugal.