Clean Chains - Chain Maintenance

And once a chain has worn such that it's length is 1% longer than the original length it will start to seriously wear out the chainrings and cassette or sprocket so if you want to prolong the life of those parts of the drivetrain that's when to replace it.

Is it 1%?! I thought it was closer to 10%?

Ok so how much are others spending on cleaning/changing their chains each year?

I don't clean or lube my chain at all... last one lasted 14 months... £9 to replace (didn't even wear through, I had a slack chain fail and it got bent by the rear wheel)