Look at it this way... Warning pages show goodwill, in a field where the *opinion* of a judge or jury as to what is "obscene" could matter a lot. I can't imagine they can do any harm, in that respect.
On the other hand, they also filter out crappy traffic without hitting bandwidth too hard. Sure, clicks to the main tour pages go down, but the people who are going to sign up will make it just find.
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