Insurance (and this includes extended warranties and such) is,
practically by definition, a bad financial decision. You're essentially paying someone else to take some of your risk away, but just like a casino, insurance underwriters charge what is pretty-much a vigorish - they take a percentage over-and-above what odds-are they'd have to pay-out in terms of making-good on the coverage they provide you. In the long-run, you're almost always better-off without insurance, just covering the costs of losses you incur from your own money.
There are a few situations where insurance is worth considering.
The most notable situation is where the potential losses you could incur would be far in excess of what you could practically afford to cover from your own money. A great example of this is the insurance you take out when you go on a cruise, that covers the cost of medical evacuation at sea, which could run tens of thousands of dollars.
Another situation would be where the insurance is actually treated by the underwriter as pre-payment for services
inevitably needed. In that case, it isn't really a transfer of risk (since the payout is inevitable), so generally such insurance is simply bundling services and locking the consumer into specific providers, and for that perhaps a moderate discounting is applied. Good examples of this include the wellness portion of health insurance, and routine dental care.
A third situation would be where insurance is bundled with other benefits that cannot be readily obtained in other ways. Some home applicance protection plans include priority service, essentially giving subscribers priority over walk-ins.
So take a look at what the
travel insurance covers, and then look at your bank account. If you have enough money in the bank (and enough credit on your credit cards to access that amount of money in a pinch, for the short-term) to cover what coverage you want from the travel insurance, then skip the travel insurance and "self-insure" (i.e., if something goes wrong, whip out your credit card and make things right, yourself).