why is it..

that myself can get a round trip ticket from Honolulu to Las Vegas for $350 but a one way ticket costs $500? what the hell is up with that, and its all the airlines, every single on of them. Of course the obvious solution is to book the round trip and not use the return flight, but that seems wrong. I suppose forcing customers to book round trips makes scheduling easier, knowing in advance what seats are taken and if everyone booked by making one way trips it could get confusing, but why charge such a heavy premium? Is it really that necessary to have round trips, the majority of bookings, I suspect are roud trip anyway. I guess it's the bird in the hand thingee..