Some of my cameras and lenses, and my laptop, are considerably more expensive than the one I had repaired. It's worth it to me to pay the small monthly premium to not have to worry about damaging an expensive camera or lens. I don't worry so much about my gear getting wet, etc.
I don't know how this would all apply to bike touring. I just know the option is out there if you want to research it. Based on my premiums, I would guess about $3000 worth of coverage would cost you about $20 month.
I don't know what the most likely peril would be for a touring cyclist. Most of the individual components are both unlikely to fail, and inexpensive. Replacement of a stolen bike could be a possibility. I don't think that happens often though. If it did, I assume your tour would be on hold for a couple weeks, until things were sorted out with insurance. Is that peace of mind worth $20 bucks a month or so? That's something only you can answer.