FlyGlobespan

We have a large family holiday to Florida next year and some of the group are looking at flying from Glasgow to Orlando using Globespan. (Not me, I will be driving to MAN and going VS, staying true to VS[:p]).
Slightly odd prices shown on Globespan website at the moment though. If you do a flights only quote for 19th July 2008 to 9th August 2008, the price out is £471 and price back is £314 per adult.
However, do a flight and car quote and the price out per adult is £280 and flight back is £235.
So total for 4 adults without car is £3140 but with car is £2417.
WHY???[?][?]
Is is because they have some fixed price FlyDrive packages and just happen to have seats available or is it a mistake??
Thanks
Slightly odd prices shown on Globespan website at the moment though. If you do a flights only quote for 19th July 2008 to 9th August 2008, the price out is £471 and price back is £314 per adult.
However, do a flight and car quote and the price out per adult is £280 and flight back is £235.
So total for 4 adults without car is £3140 but with car is £2417.
WHY???[?][?]
Is is because they have some fixed price FlyDrive packages and just happen to have seats available or is it a mistake??
Thanks