I have wondered about this since I was a kid. I always guessed the reason was because they were 'equals' both financially and socially and they understood the life the other lived because they live it too. I guess they think this makes for a better relationship than they could have with a 'regular' person. SO WHY IS THE DAMN BREAKUP AND DIVORCE RATE SO HIGH AMONG CELEBRITIES??!!
Maybe they fight over money and egos, or cheating with other celebrities. One other guess I had, about movie stars in particular, is that sometimes when they fall in love on the set of a movie, maybe in a way it's the character they are falling for and not the real person. Once they get the real person home and have to live with him/her, they don't like them as much as the character?
Most people who are married before they get famous end up dumping their old 'regular' love as soon as they hit the big time. Bono and Larry deserve a BIG amount of praise for still being with their high school sweethearts from the old neighborhood after all that money and fame!
(And it wasn't Edge's fault he and Aislinn broke up, it was hers, so we can't blame him. I am unsure if you can categorize Morleigh a 'celebrity' just for being the tour belly dancer?)
And a big
to Billie Joe Armstrong of Green Day for marrying a FAN, yes a fan, and sticking with her! Now isn't that every fangirl's dream?
One final thought: Once people are 'loaded' maybe they look upon 'regular' people as only after them for the money, or to further their career. I know he's not 'that' famous but Star Wars actor Hayden Christensen (Anakin) said he'd been hurt twice by girls he dated after they had publically admitted they didn't even like him, they only wanted to be seen with him to help their (alleged) modeling careers. So that must happen a lot too.
Heiress Doris Duke lived a long, lonely life because her father convinced her no one would ever love her for anything but her money so she shut everyone out.