Good or bad luck?

..in my country we believe that a black cat brings you bad luck but i read some stories...:
It’s also been long believed that black cats invite not only fortune in the way of good luck, but also in the way of wealth. French peasants long believed that if a black cat was released at a crossroads where five roads intersect, the black cat would lead them to treasure.

English sailors could probably have used a matagot in their home to bring them some extra wealth. In ye olde times, black cats were thought to be so lucky and such and assurance that sailors would return safely home from sea that many black cats cost so much as to be unaffordable for seafarers.