event, named, or unique footwear is very desirable amongst players, and while these shoes were released in larger quantities people will still pay a decent amount of them.
I've personally sold a pair for around 15m, and have seen them sold for as low as 10m, and as much as 30m, so you can certainly do better than 14m if you try. But if you're interested in just being rid of them quickly 10-15m should see them sold rather fast.