If he had used SPs he might have been better off as he could have said "Hey, it was just a sexual passion thing/variety thing". By having 10+ mistresses long term he is saying he wasn't happy in his marriage. Come to think of it with 10+ mistresses how did he ever find any time to be with Elin at all?
Sure, if single he could sleep with a different girl every day if he wanted to (he wouldn't be the first) and re-brand himself as the young Hugh Hefner of the golfing world. Sponsors would still go for him...condom manufacturers, etc.
As has been said though, his wife has been busy the past years having 2 kids for him and 10+ mistresses is a sign of big time disrespect of her. Getting a bit on the side when her newborn was taking up all her time is one thing - and one g/f on the side after the birth of baby #1 I think Elin would have forgiven, but more girls every day coming forward - 10 as of today - makes Elin a laughing stock...even if she didn't privately care where he stuck his putter before, having the whole world know he cheated on her whenever he could with whomever he could would cause her to be major league annoyed.