Titanium is used in space ships. SPACE SHIPS!!
It is practically indestructable. Doesn't rust either. Steel is good, but Titanium is true bike porn. Which I thought the program was about. I suppose though it is his bike not mine. I doubt you would get two bikes the same if you asked everyone to put together their perfect bike. I for example would have gone for some crazy paint scheme probably involving pink. Most would consider this madness.
Sorry, I wasn't implying that it wasn't - I'm fully aware of the strength of titanium (I knew my Chemistry A level would be useful one day) but his budget might not have stretched to titanium and given those constraints, steel would be worthwhile option.