It was in the Nice airport stats about the air traffic being 50-50 leisure/business, so not for BA only (which I suspect has more personal/leisure than average if only given the number of regular commuters with secondary homes), and I suspect outgoing is a bit more business-oriented and incoming a bit less. Overall visitors on the Cote d'Azur are roughly 20% business-80% personal+leisure but that includes cars, cruises, and coaches all of which are almost 100% leisure (and cars is the biggest influx by far) and train which is also more leisure oriented given the paucity of fast train links into Nice.

Nice is actually a significantly larger venue for conferences than Cannes, the second after Paris in France. Cannes has a few iconic ones like the MIPIM in March, but some of Nice's regular annual congresses notably in the health field (medicine, pharmacy, etc) actually add up to more. Monaco also has a number of significant congresses.

PS I don't think we should get too OT though!