Yeah, but "spreading the wear" on the cassette....
or the chain? I'm thinking it wouldn't matter if the chain were a (theoretical) 100 feet long, (everything else being equal) the pedal strokes, wheel rotations, distance traveled, and the chain's wear on the cassette, wouldn't change an iota.
The chain itself (or a given section of it) would get less physical exposure to the cassette cogs, and presumably the entire chain would receive less wear because of it, but the cassette (what the OP is actually asking about here) would receive the same exposure/chain rub that it would with a shorter chain, and wear no differently. Or that's what I'm thinking, anyway.
(and even though I'm not trying to be argumentative or critical, just shooting the breeze here, but in typical bikeforums tradition, I'll be standing by for a scathing ball-busting
)