Experiences also make for good story ideas. Usually, it's the bad experiences that are worth more when articulated in story form. Of course, in many, if not most, cases, you'll want your character to experience worse than you have, for the sake of drama, but you can still wring your experiences for details. Some people who have seen some really, really horrible stuff do the opposite -- that is to say, they tone it down, presumably to make the story more socially acceptable than the reality. I believe Oliver Twist is one example, but usually, it's the other way around.
For example, if you've ever spent even one night outdoors (not recreational camping, but because you had to), in a car, or in a shelter or storage locker, it will be easier to write about a homeless character and add the details that bring the story to life than if the closest you've ever come to even associating with known homeless people was when they begged you for money. However, as it would be foolish to destroy one's financial position for the purpose of gaining inspiration, one might also obtain second hand experience by volunteering at a shelter, drop-in center, or soup kitchen and talking to the homeless and/or the hungry.