I've noticed this when trying two migrated faction games besides Pergamon, other places (at least southern Gaul and the Bosphorous) are quite resource-poor by comparison.
In Asia Minor we have a dense collection of settlements which are invariably large (lots of tax), coastal (so ports for trade income) and a number have mines (mining income). They're also close enough together that the land trade is pretty good.
Sure you've got unfriendly neighbours (Seleukids, Ptolemies, Pontos and possibly the Aedui in Galatia), but you've got the resources to deal with them there. Even just two settlements is usually enough to maintain a half-decent army which you can use for raids to get more money. Or conquering.
Other places don't seem to really compare. Is it the richest spot in the game?
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