No no no. All the Pontids should have to do is hold all of northern and central Anatolia, and control the Dardanelles and the Bosporus. Historically, if they had done that, they would have had a stranglehold on all east/west trade, and would have been richer that Croesus (who did quite well with much less territory).
Gameplay-wise, this would be pretty hard. The Pontids would have to hold off Seleukid and Armenian expansion, destroy the kingdom of Sardis, and take the tip of the Thracian peninsula from the Macedonians and Dacians, and then defend it from the Sarmatians. But if they did, they would be rediculously wealthy.
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