Unfortunately the race itself is just an after thought to justify the big closed-road sportive raking in cash from the mamils. So it needs to be in a reasonably sized city that can accommodate 10k fee paying customers. And large parts of the finale are routed on the bypasses rather than the interesting roads so there's less inconvenience to residents when they're shut all day for the 'slightly slower' riders. Almost all their website, and all the press coverage, is about the sportive.