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I don't understand why an 8 year relationship entitles the ex to half of Martina's millions. I'm assuming the ex is an able-bodied adult. If she is no longer welcome in Martina's four houses, she should get a job and lease her own apartment.
If the ex contributed to the couple's wealth (beyond "emotional support") and helped to pay for the houses, she should absolutely walk away with that money -- and even if she didn't, a small amount of money would be nice since Martina can afford it. But the whole "I spent your money when we were a couple, so you must support me now" business is silly.
Spousal support started a long time ago, when women stayed at home and depended on their husbands for financial support. These days, both men and women should be able to support themselves regardless of their relationship status -- especially when they don't have any children.
Did this couple have the option of a prenuptial agreement? If it was not an option, you really can't expect Martina to give up her money in the name of gay rights... and if it was an option, I hope Martina has learned her lesson.
This is one reason I am in no rush to get gay-married.