I like titanium because it's:
1) Pretty
2) Corrosion free
3) Light
4) Has its own special place on the Periodic Table
5) Cool
I started out with watches where the light weight really does make a difference.
I know that a Titanium regulator is hard to justify for practical reasons. But I'm sure most of us possess one or more misguided preferences.
I have to admit I don't dive my Mk11T. I like the T part, just not ScubaPro first stages.
I take that back. I do like the Mk2. I'd like it more if it was made of Titanium.