I wouldn't think they lease those rides, because they are operated by park employees, not outside contracted employees (such as for the laser show). I'd think that capacity would have more to do with it, and the opportunity to gain more profit. What's interesting is that very few people complain that these attractions cost extra, whereas if they were to charge even $1 for a coaster I'm sure we'd all be wailing. Still riding, of course, but less than pleased with paying for it above the admission price.
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Po!nt of View: A different look at Roller Coasters.
http://www.crosswinds.net/~justmayntz/thrills/