The price never includes that. I've booked a $14 rate, but that didn't include stuff like airport fees and taxes. A lot of times the airport fees are flat rate and $6/day seems a lot more when it's a $12 daily rate compared to a $40 daily rate.
However, the one thing that ticked me off about a Priceline winning hotel bid was when we checked in. The hotel had an "optional" resort fee of $25, which included parking, two drinks at the bar, pool towels, local phone calls, and two bottles of water. We could have just paid for parking for $20. Anyone booking directly with the hotel chain didn't have to pay for any fees to get the included resort fee package. Of course it was a resort hotel in Maui that normally cost $300, and my wife got it for $160. I guess there was a tradeoff.