union 1's pricing

ive noticed the union ones in red vs blue the priced differ alot the red is £200 ish and blue over 1000 why is this even with the 'crash' of the sneaker market ik some unique shoes will hold value but is the blue just rarer or lower quantity? ive always loved the reds and definitely will pick some up but just noticed the price difference and wondered why (based on stockx prices)