It is absolutely irrelevant what the mark up is on the Goodwood events, landing fees or anything else there, just as mark ups on nice cars, good holidays, or even a decent pair of shoes is irrelevant.
If you think it is worth it (ie. you can justify it to yourself) you will do it. if not, you won't.
I personally cannot justify £200 grand on a car, but I don't moan about the car maker charging £200 grand, I simply don't buy one (a/c no problem
)
Please don't go around whinging about stuff you can't justify (or afford), just don't go.