[pizza234]

Well, first of all, research attemps to extend life are not like solving engineering problems - it's not somthing clear cut.

Minimal advances for example may take years and years.

And especially, how do you know that those advances are going to apply to the person who's founding the research?

What if one is at risk of heart attack? Should he still invest in life extension?

The concept of "curing [almost] every known disease" doesn't make any sense.

In this perspective, investing in life extension looks more like gambling to me, because we're dealing with non-deterministic contexts. So much for rationality.

Luxury commodities are an entirely different thing. As people pointed out, they satisfy some different needs.