130 pounds for lifetime expansion, is it worth the money?

We have limited time opportunity now to buy Lifetime Expansion Pass for Elite:Dangerous priced at 130 pounds. At first glance 130 pounds looks like crazy amount of cash to spend just on one game, but is that so? To answer this we need to take a look at Elite: Dangerous future, compare with some other games and just honestly answer ourselves - are we having enough fun in Elite to return playing it over and over again.