You continue to refuse to accept that leaders and civilizations are not tied together in this game and that there will always be civilizations without leaders and leaders. There's no help for refusal to accept reality.You can go over it as many times as your fingers can type, them still dont make it the facts or will change my opinion
No Civ DLC to my recollection was ever released without a leader to go with it or had one already in the game .
No DLC in any version of Civ was sold with just one leader , Caesar was link and free
The Viking scenario pack had a fair few other items included.
No idea re your idea of inflation but one Civ at $ 6 to play for 1/3 of a game, sounds a lot like more expensive to me.
Thou at least with the new toon's you can gain items and level up
Civilization VI was released in 2016. A single civilization DLC was sold for $4.99. After inflation, that would be $6.68 today. A single civilization DLC for Civilization VII is currently also selling for $4.99. It is, therefore, cheaper than previous DLC.
(I will grant that DLC used to come with scenarios and it's a shame that it no longer does, but I don't think most players bothered with the scenarios, anyway. Maybe resources are better spent elsewhere.)