If you have much trophies but not so much money, then it is cheaper to train than to buy, at least with humans. It's cheaper to train guardsmen to paladins than to buy them, and even cheaper if you buy swordsmen, train them to guardsmen and finally paladins. Of course it costs trophies, not only monies, and I think that money is not a problem in that game, but someone may find a use for this. Plus, you have to get at least the same leadership of troops as you inntend to get, so any excess leadership (and accompanying money) is lost.
And I agree that one of the best uses is getting Royal Thorns.
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