The problem with the high prices is in math rather than design. Say a game sells packs for 5 dolars. You would then need 1000 players to pay to get 5000 in income. If a pack costs 50 you would only need 100 to pay to get the same income. Problem is however that no matter the cost you those 100 will pay no matter what, and even extreme lowering of prices wont get you up to the 1000 paying customers.
With that said, yes, the prices are extreme in Tyrant, and arguably a bit too extreme. But just wanted to say that the discussion is a bit more complet than just that. The devs need to live from this too, so sometimes the prices need to be too high for the regular player.
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