I agree. It all depends on the sponsor.
Won round-trip tickets from Air Canada to anywhere I want in Canada. Still have to pay the taxes on the flights.
Won a trip for 4 to BC and in the rules it states that the winner is responsible for airport taxes. The flights were booked and paid for by the contest sponsor instead of having me do it. I didn't pay anything. Only have to pay to get myself to the airport and to the hotel when we arrive.