Given they're basically saying they drive for fun and this is a way to cover some of the costs, that seems kind of moot. Nobody's paying me enough to buy a new motorcycle after mine wears out, but I'm still gonna take it out and ride it.

Yes of course. Looking at my records it's something like $0.65/km driven in revenue, which is well over the $0.54/mile quoted by the IRS for all-in vehicle costs.