Theoretically you're right about different tooling and slower production increasing costs, and if the titanium was the only mount offered, they could sell it for maybe $2475 instead of $2500.
But according to this thread it seems that titanium is better in 0.01% of circumstances (EXTREME temperatures and possibly also EXTREMELY heavy lenses) and offers no benefit in 99.99% of circumstances.
Saving 0.01% of your customers $25 is not worth forcing the other 99.9% to waste $1975. Red absolutely made the right call offering it as an option for those few that need it.
Edit : Ooops, by the time I'd typed this a couple people had already covered all the same ground. Oh well...