Notre Dame gets all that money because it is a tourist attraction, one of the reasons why people visit Paris, and Parisian businesses will reap the benefits when it is restored, so of course they are willing to invest in the restoration. That makes them look good, probably makes them feel good (because they probably appreciate the beauty and history of the cathedral as much as anyone), and will pay off in the long run.
Local businesses, unfortunately, don't make money by saving the bell-towers on small churches.
Local businesses, unfortunately, don't make money by saving the bell-towers on small churches.