For all those wandering WHY wizards don't use their powers to get money from the Muggle economy...

Canon!Lucius does, according to Rowling (from her website Pottermore):

" The Malfoy name comes from old French and translates as 'bad faith'. Like many other progenitors of noble English families, the wizard Armand Malfoy arrived in Britain with William the Conqueror as part of the invading Norman army. Having rendered unknown, shady (and almost certainly magical) services to King William I, Malfoy was given a prime piece of land in Wiltshire, seized from local landowners, upon which his descendants have lived for ten consecutive centuries.

Their wily ancestor Armand encapsulated many of the qualities that have distinguished the Malfoy family to the present day. The Malfoys have always had the reputation, hinted at by their not altogether complimentary surname, of being a slippery bunch, to be found courting power and riches wherever they might be found. In spite of their espousal of pure-blood values and their undoubtedly genuine belief in wizards' superiority over Muggles, the Malfoys have never been above ingratiating themselves with the non-magical community when it suits them. The result is that they are one of the richest wizarding families in Britain, and [b]it has been rumoured for many years (though never proven) that over the centuries the family has dabbled successfully in Muggle currency and assets. Over hundreds of years, they have managed to add to their lands in Wiltshire by annexing those of neighbouring Muggles, and the favour they curried with royalty added Muggle treasures and works of art to an ever-expanding collection. "