Is there any country that matters that doesn't have easy water access? Russia?
Also same deal for Winter Olympics since there's a lot of water up there?
But one of the things that turning the Games from a maybe-just-once event for a city/country to a recurring relationship does, is that it changes the nature of the profiteering.
A one-time-only event encourages profiteers to cut as deeply as they can can and really screw their customers -- no repeat sales are possible.
A recurring event still presents a large profit opportunity, but the recurrence encourages more cooperative profiteering. Contractors who don't come through or who overcharge beyond the pale don't get the repeat business.
(Of course, this doesn't always happen, and long-term graft is definitely a thing, but at least there's a possibility things might be different with a permanent venue.)