Well, if the market will bare it, they'll charge for it!
That said, I'm pretty irritated with the parking pass structure for SFO, which sounds similar, in that you get a string of tickets instead of unlimited parking lot access. Granted, that park needs to everything they can to limit parking, but it did go along way in preventing me from doing my little after work visits.
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Jeff
Webmaster/Admin - CoasterBuzz.com