They are more expensive, like 1800. The problem is you can't get cohorts and all their supporting units and still have money for a cavalry unit or 2. That is unless you take less units and taking less units is actually a serious weakness.
The average line infantry cost for a semi-balanced army is about 1300-1400 unless you are phalanx and then you employ really expensive line infantry and cavalry and cost effective filler support like hoplites and celto-hellenic hoplites and then you buy the cheapest missile units possible to fill out(3 slingers).
Rome is comparable to the latter case except their expensive line infantry is cheaper but their support units cost almost as much as they do so you have to skimp on cavalry or archers and you don't have very many cheap options for either.
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