I plan on buying it direct from Steam, I figure Fireaxis deserve the money. I've sunk getting on for 300 hours into Civ V, I expect I'll sink a similar amount of time into Civ VI. At £50, or £70 with a ticket for upcoming expansions, I think that's pretty big bargain.
I've done over 1000 hours in Civ 5, god only knows how many hours in total when you add in the hours in Civ 1, 2, 3 and 4 as well. However, I will not be held over a barrel , no matter how good a game is, by the almost arbitrary price rises of PC games in the past 24 months. They are unnecessary price rises and the only reason why games , which for so many years on the PC were around the £35 mark have suddenly shot up, is because people pay it. Its not a matter of worth for me, its a matter of principle.
(It reminds me of the console gaming situation from many years ago, where PC games were coming out at the £30 area and the same title on console was being thrown out at £50 because the console gamer was paying it. How we PC gamers mocked consolers for it, now we are doing the same).