I'm assuming it all depends on the status of the two people involved in the relationship. Whether they are in love, planning to get married and/or start a family also would play in the 'pros and cons'.
Just flat our dating someone of higher profile/status would be each persons decision and whether or not the lesser of the two would mind the other
being in the spot light or whatever. I wouldn't mind being in someone I loves shadow, but some people might?
What a tough question Questor! Did you run off and meet Tom Cruise or something while on holiday?