That seems like a lot for a delivery charge. Most places are 2 or 3 bucks for delivery. And yes I still tip, under the assumption that the delivery fee does not get seen by the driver at all...which is generally the case. If they really charged 5 dollars for delivery, I'd ask why it's so high, and if the driver incurs any of the charge as income. If they said yes, I'd still tip, but much less since a couple bucks is already going his way anyway. If they said no, I'd still tip about 10-15%, but probably wouldn't order delivery from them gain, as that's just a ridiculous service charge.