I pay around £13 a month. It's gone up since I got it for £4 a month nearly 15 years ago. However, it's gone up very, very slowly with most of the years being only around £50 for a year. I have accidental cover too for the past 6 years. Total paid? Around £500 for 15 years of cover.
I have claimed twice. Once for a small flood which ruined a tatty old leather sofa that we had been given for free, a carpet that didn't fit the room and a very old pc (the room was a smoking room farm workers would come sit in in muddy clothes). Nothing worth much at all. An assessor came out and we got "new for old", no matter how much we had paid (or not in the case of the donated sofa!). We were very upfront and honest but we ended up with £1K for a new sofa, a £400 new PC and whatever it cost for new flooring, that fit the room this time! All that with £100 excess paid by us.
The next claim was our kid's iPad mini. For 4 years they had kept it pristine and 5 minutes with a visiting friend over and it was smashed. Ugh. Called up the insurers, they picked it up, couldn't fix it so sent us £430 (less £100 excess) for a brand spanking top of the range new one.
I won't be without contents insurance for even a single day. I even phone them for special coverage on moving day in case anything goes wrong and our goods are damaged or stolen in transit.
In reality very few people can afford to replace everything just like that. They may think they can but what about every seemingly insignificant thing? Toothbrushes, toilet roll holder, Kids swim goggles, Dog bowls, houseplants, chargers, even egg cups. Individually they're worth nothing but buying every single thing brand new mounts up immediately.