How much of your income do you actually allocate to rent?

I'm just curious. Tons of online financial advice says that a person should only be putting 30% of their income towards rent, but I feel like that percentage is actually a lot higher for many people in Seattle. Right now I spent about 24% on just rent, but that is only because I have been renting from a friend's parents. If/when I have to move, I suspect that number is going to go WAY up.