Putting off your opportunity to make that insight by fantasizing about immortality and indefinite life extension mostly just makes your life more difficult and stressful.
Personally I'd be interested in seeing what sort of insights I could come up with over the course of a couple thousand years.
The word "fantasize" especially is bizarre - we're discussing a premise (arbitrarily extended life), and you're using a word that escapes the premise (a synonym for "it's not real").
As a premise, it might not be psychologically good for people if it was real.
There is no warmth without cold; there is no life without death.
But I would sign up to be a brain in a vat as long as I could read and write. Someday, Fyodor, someday.
>There's a finite amount of ... experiences
I very much doubt that is the case in anything but the most pedantic, philosophical sense.