I guess my point is: If they are happy with the numbers the park is producing, why spend the money?
CP has hotels to fill (and basically an economy to support) so they likely have more robust entertainment to fill those rooms.
Kings Island, on the other hand, has people who visit the park multiple times a year, buy add ons, and enjoy a solid park, with "just good enough" additions.
I would personally love more enterainment: clown band, a train show, pop up shows, PTE-level season long shows in KIT. However, keeping the fireworks every night, having Grand Carnivale, Winterfest etc is a better use of entertainment dollars IMHO.