or just buy the ticket from a telephone agent where there is absolutely no mention of any contract
or just buy the cheap hidden city fare without another thought on the matter, until after you've flown the first segment when you'll be able to spend 10 minutes online requesting a refund of the unflown segment for the trivialist of delays or shed change.
it's that easy. do it at a reasonable volume of a leisure travel and you'll be fine. seriously.