Agree, lust for metal seems to be a big part of the EDC top phenomenon, and the more exotic the better.
And what better way to carry around a chunk of your favorite metal than in the form of a small endurance top you can show off? Everybody likes to see tops spin. At the right time, you just work in that yours happens to be made of super-rare warhead-grade tantalum-niobium-osmium alloy.
I totally get that. I like cool metals, too. Better yet, a super-rare warhead-grade tantalum-niobium-osmium top would make me the coolest guy on the forum!
Titanium is also a very cool metal. I'm jealous.