I believe Lewis Hamilton employs one of his childhood friends to be his full time photographer as well.
Not sure I agree it's 'too good to be true', the stars have really got to align for it to work for both parties and it's going to take a very particular sort of individual to cope with the stresses of it (the travelling, the schedule, the loneliness, the different skills required, mixing in very unfamiliar situations and social circles, even if you are just on the periphery of it).
£80k for an all expenses paid year travelling the world sounds great, but give it some thought and you really are sacrificing a year of your life (day and night).
I've done 'live in' photography for an extremely wealthy client before (only a week, though) and even though I was in a beautiful place, living in the same incredible property that I could never afford a single night in myself, eating the same amazing food as them and so on, that novelty wears of remarkably quickly when you're literally living minute to minute on somebody else's schedule (and still working when they've gone to bed otherwise the editing backlog becomes unbearable).