I was a GV Captain. But I never got anywhere close to earning 300k a year! A complete resignation to no life outside of work and horrible abuse by employer bought me about 100k a year! Then upon renewal with no job 100k required for a 5 day sim course to be paid by me in the hope of finding a job? I don't think so!
Gulfstream world is utterly vile with egomaniacs stabbing everyone in sight so be careful what you wish for?
100k for ANY bond is appalling of course. But what is the situation if they fire you before the bond expiry?
I have refused jobs over bonds. Most recently with a "non decreasing bond." That is simply unfair and needs to be binned by everyone. But people accept it.
Unfortunately there are always Ar@e lickers everywhere in aviation that will agree to anything to get one over the next guy. Thereby destroying everyone's future.