Well, I guess you'd only have the cartridge rebuilt if it wasn't still possible to buy the same model new, or if you had a cartridge worth considerably more.
But bear in mind that price is for a complete cartridge rebuild, not just a retipping, which is what the Australian price covers.
As the Cartridge Man site says, "A rebuild will typically comprise stylus
replacement or re-tip and overhaul/replacement of cantilever, suspension
and coils as necessary."