Assuming they all work in a roughly similar way then one of the 'perks' is that Bosphorous will replace any cymbals he bust's.I don't know how endorsements work. If you are not interested in getting cymbals in exchange for brand exposure, what is the point of the contract?
I recall a conversation I had with Jamie Oliver (UK Subs drummer, not the crap chef). He has an endorsement deal with Stagg cymbals. He broke his main cymbal once and had a sparkly new one arrive with him prior to his next gig.