I'm just going to put this here...
Rome 2: Total War (bought in sale, one year after release): £30
3 Campaign Packs @ £10 each: £30
4 Faction Packs @ £6 each: £24
2 Unit Packs @ £2 each: £4
Total cost = £88, for a product that is now two years old, still contains a fair number of bugs, is no longer getting a fraction of the development it used to get (because of the new game, Attila), produced by a company with fifteen years of continued experience in their chosen field.
I bought it, I loved it (as I did with all of the previous TW games), and yet I still only racked up 64 hours of game time before I got distracted by something else. For the record, my highest game time in any of the TW titles is 113 hours in Empire: Total War, over the six years I've owned it, and for all five of the TW titles I have on Steam my combined game time is just 250-ish hours, for an estimated cost of roughly £200.
Elite: Dangerous, on the other hand? I've racked up 130 hours in the less than four weeks I've owned it (which, coincidently, is the highest individual game time I have recorded for *all* the games I've bought through Steam since signing up with HL2 way back in 2008), have truly enjoyed every moment so far, and as it stands I fully expect to still be playing it for a long time yet. As a result, I really have no problem paying £120 (incl. discount) for the Lifetime Pass, as I'm reasonably confident that I will get more than my money's worth out of this game in the years to come.
I may be wrong, but only time will tell.
Just saying.