Why would anyone want a Ti stem?
Aluminium can be made into a stem which is lighter, stiffer, and cheaper.
Tis shiney though.
Aluminium can be used to make a stiffer and lighter stem than Ti. There may be some comfort to be afforded from a Ti stem, but I would'nt know. Plus people pack away their carbon in the winter to aviod damaging it though cycling in poor conditions. As a polymer scientist I can confirm that carbon composites do not rust ;)
;)