I can't quite believe those stats. They reckon that last year had over 250,000 visitors and if the UK is 14%, that's only 35,000. I've seen all sorts of estimates about how many Brits are over there, but it's a good bit more than 35k.
Anyway, even if the stats are right there are less than 50,000 foreign visitors attending; if nearly 16,000 foreign visitors spend (on average, say) €400, and nearly 10,000 spend over €500, that's ~€12m. 93,500 of the French visitors spend only (on average) €75 each, which is only €7m.
Why do they bleedin well insist on broadcasting the race commentary in French, then?