I believe right or wrong that those places should provide parking facilities for those using the services offered free of charge. Not use it as a means to make money.
Not really just dont like being ripped off by car parking companies. I fail to see how somebody should be charged for giving their business to a firm whether it be a shopping centre, airport or hospital or any other business.
I never pay to park at Gatwick if picking somebody up I always sit in McDonalds car park with a coffee and tell them to ring me once they are through customs then pick them up by the drop off point. Even if they are coming into North Terminal it is only a couple of minutes for them to wait.