It's true that they are probably selling these items for decoration rather than real magic, and I imagine very few merchants would have the skill to give them power, but that doesn't mean they don't have potential.

[ How do you explain magic these days? Most normal humans won't buy it. ]

If you make a suggestion, you create the bed of possibility. If someone else comes along and happens to be able to fill it, then even a common object can become something fantastic.