Sometimes you have to play the system!
I have never delayed a flight as I travel light.
If I am travelling on freebies (my money!) then any upgrade is a welcome addition to the trip. If I'm on business (earning freebies) then I am paying for the extras - hence CIP status. Either way it doesn't actually cost more to convey a first class pax or an empty seat in first compared to economy. More fool those that don't check!
Exec jet travel is convenient but not cost effective over very short distances - nor is it much quicker - unless you are flying through Heathrow!