Because they are tired of carrying so much money in their pockets and wanted to spend some. haha
Seriously, because Paris is very well known for fine cuisine, high fashion, world famous museums, architecture and rich history. Kind of like NY except everyone speaks French. And the French food is authentic. haha
Also, bc Wise Owl and Cabal enjoy Paris and 2 Frenchmen/women can't be wrong (or is that 80 million Frenchmen).