Before my recent sojourn in not all that sunny Spain, I hunted around online in an attempt to find cheaper airport car parking prices for East Midlands as it is horrendously expensive there.Whichever company I used it made no difference. The astronomical prices came back the same.
It was cheaper to book a flight to Alicante than it was to park my car for a week!
This suggests two things:
1] Rip off.
2] A cartel?