^I'm not quite sure, but I think I remember you or someone else say that X was originally meant to cost $8,000,000, but with all the problems that occurred, it eventually built up to $17,000,000? Is that right? :?
But I still think more parks might've considered getting one if X wasn't such a mechanical nightmare. After all, X was really popular with the GP when it opened (without considering the break downs and/or queues, just the ride itself).
And I don't really think size is that much of an issue. They're not really that spread out, and I'm sure Viper takes up a similar amount of space and park's were buying Arrow multiloopers.