The thing to keep in mind about the Daemon Prince is that it's a melee beast, and Monstrous Creatures only go 6" a turn and can't ride in transports. It doesn't really matter how much you re-price the wings, you're not going to make foot-DPs viable. People are going to pay for the wings right up until the point you price them out of using Daemon Princes entirely.
Also consider that if you're building a Daemon Prince on a budget you're usually better off with a Greater Daemon. The Daemon Prince gives you 3+ armour (which isn't worth that much on the ground) and the ability to mix wings/Mastery levels/different daemonic alignments, but he's going to be more expensive than an equivalently-kitted Greater Daemon and have a weaker statline out of the mix.
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