[glang]

Im no expert but I think the main problem with chains is keeping the lubrication in the links. If you can do this then the moving internal parts wear more slowly so the chain 'stretches' less which then reduces the wear on the sprocket.
Unfortunately it turns into a vicious circle because as wear takes place the link seals can no longer keep the lube in so, unless it is continuously replaced, the moving parts run dry and wear much more rapidly....