But is there any harm in nabbing a pair of "Louboutins" from a market, or a "Chanel" handbag from a chap selling them on a foreign beach?

To the average punter it might sound a bit far-fetched but their cash goes straight to a drugs cartel or gun-runners.
Buying such items clearly poses a health risk. The same can be said for toys which aren't up to safety standards, and sunglasses which don't have the recommended UV protection.