Titanium is more expensive than it is valuable. Most of the high cost of titanium products comes from the relatively very expensive purification process and difficulty machining.

"is more expensive than it is valuable" does not makes sense, since the value of something is what people are willing to pay for it. If it is expensive then it has a high value.

Not so. Expensive - how much it costs to make it. Valuable - how much someone else would pay for it.

So, if I was to spent loads on parts to make a relatively useless widget that fills a particular niche in my daily life, it would be expensive, but I wouldn't view it as valuable. It's only as valuable as it is expensive if there are lots of people who want it, which is not the case for custom work.

To expand further with example; a titanium under plate may cost $2000 to install(amort design, testing, manufacturing, etc.). But unless you happen to own a Telsa with a missing under plate it's value is less than $100 as scrap recycling.