I think that anyone considering renters’ insurance should take the responses to this thread with a grain of salt. There are two obvious sources of bias that will seem to tilt the balance toward getting insurance.
The first is that people who don’t have renters insurance and have never had anything bad happen are less likely to respond. People in general (and IMHO message board posters in particular) are story-tellers, and “Nothing happened, but I had an extra $15 in my pocket every month” doesn’t make for much of a story.
The second is that it doesn’t even have to be your own story. Obviously, since the cost of insurance is so low, the risk must also be very low. Yet odds are that everyone has seen a news story or knows someone who has had some catastrophic loss. People tend to be poor judges of risk (except actuaries. They tend to be very good judges of risk), so they overvalue this anecdotal evidence.
Most of the advice about considering what you would do if you didn’t have any of your stuff, and how big an impact it would have is good, but if you do have so many expensive possessions that you can’t replace them, perhaps you should consider putting more money into an emergency fund and less into buying new things. You should also realize that you don’t have to replace everything immediately. Using myself as an example: I’d estimate that my possessions, less my car, are somewhere in the $5-10K range. There’s a laptop, some home theater stuff, a few thousand in clothes, a bit of furniture, etc. Like lots of people. But if my (rented) house burned down tomorrow, I wouldn’t really need $10K immediately. If I have to go six months while I save up for a laptop, it wouldn’t kill me. My DVD collection does not need to be replaced title-for-title the day after the fire. I’m sure that I could buy a serviceable wardrobe for < $1000, and add to it as I go. The fire would suck, but it would not be catastrophic. And that’s what insurance should be for: true catastrophes.
I’m not totally down on insurance, but I think people tend to overinsure for possessions, and underinsure for true catastrophes. For example, many people have fully insured cars, but low liability limits. The risk of a huge payout from crashing into someone who buys a lawyer and a neck brace is way higher than losing the $10-20K you probably have in your car. People have crappy health insurance, but they insure grandma’s pearls against theft.
As pointed out, some insurance is a bad deal. Extended warranties are a good example. My personal philosophy is that insuring against anything that I could afford replacing is a bad deal. In the long run, I’m likely to do better. That $20/mo invested in the stock market is worth a year’s salary (inflation adjusted) when I retire.