Man this Changing sprockets and chains at the same time idea is total BS, just a myth that was probably started by some chain company. If you were to sit down and work out how many times a particular chain roller would meet up with the same sprocket tooth it would be negligible. Unless your sprockets are super hooked out a chain won't get any accelerated wear than what it would from new sprockets. Change your chain when its got too much side to side bend in it and change sprockets when you can notice the teeth starting to hook out.
I've always run Renthal aluminium sprockets and DID Race or X ring chains and change them out when they are done, I regularly get 30 + hours out of X ring chains and 25+ out of sprockets both depending on how much mud and sand I ride in during those hours, I've never counted how much I get out of race chains, they are cheap when I do a top end on my 125 I throw the chain in the bin.
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