Patronus

I recently found a strange contradiction in the concept of wizarding money.I'd like to know if my idea is true atau if there is a counter-argument against it.

In pg.65 of HP and the Chamber of Secrets,we learn that Muggle money can be exchanged into wizarding money.

We also know that potentially valuable(in a Muggle point of view) objects such as chairs can be Conjured oleh magic(eg:Dumbledore does this in the courtroom in HP and The Order of the Phoenix).

So any wizard who knows basic Transfiguration can Conjure objects such as chairs,sell them to Muggles to obtain Muggle money and then exchange this money into Galleons,thus obtaining an infinite amount of wealth.

Doesn't this contradict the whole point of wizarding money?

Thanks in advance for any help.