"Never lost a chain and by using ceramic chain lube sprayed on the INSIDE not the outside, (nothing touches the outside anyway, so why lube it)."
The idea of a roller chain is that the rollers roll. Lubricating just the inside would leave an unlubricated patch as the rollers rolled, accelerating wear.
But it seems that normally the lub spreads right round the roller, partly because the sprocket teeth retain lube and pass it on and partly because the centrifugal force and surface attraction spread it over the surface.
It's one reason for directing the lube at the inside junction between main sprocket and chain, some of the lube gets on the sprocket too.
But you are right, spraying lube on the outside of the chain doesn't get it to the inside, where it is most needed, very quickly.
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