I generally trade with everyone and anyone, even one I know I'm going to backstab in the next few turns. Why not make a quick buck off them in the meantime? There are Romans and Greeks and Gauls, but gold is colour-blind.
While it's a pickle that the other faction also makes money from trade, consider this: you can usually spend the cash so much more intelligently than the AI does.
For barbarian factions, even more so. Their problem, I find, isn't a lack of money, but a lack of population. In a way, pumping them full of cash is a good thing as it encourages them to depopulate their cities faster. Kind of an exploit, I know, but hey. I'm bringing civilization to their muddy little hovels.
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