Warner Bros.

Not that the Weasley income should actually matter that much. In a culture where everyday goods and services are magicked into existence or the result of slave labor, a functioning economy is virtually nonexistent. Sure they have bank vaults full of gold and fancy coins to pay for school supplies and Butterbeer to keep the masses busy, but unless they're investing in the Muggle market, they might as well be paying with Monopoly money.