It's an incentive for people to draft who don't normally do so, and also a good reason to hoard every box you can find.
That assumes that the usual deck pimping types will actually care. These are reprints, after all, and every one of them had a previously available first-print foil. They don't match dual lands like foil onlsaught fetches, and a certain subset of collectors prefer that.
I'm only guessing, but I think they'll settle in somewhere right around judge foil prices for onslaught fetches, and maybe a tad higher for zens. Shocks, there's no telling. I'm thinking between $100-150. Honestly, more than that and people will just buy real dual lands.