Alex' post pretty much covers it, but I might add that raw optical performance of an eye piece has less impact on the price than one might think. It can be had at very modest prices.
People pay big dollars to combine high performance with aspects of comfort and aesthetics, the main ones being eye relief and apparent field of view, so much so that the premiums paid for those two far exceed the cost of performance alone. Compare prices between Plossls and 100° wide field eyepieces, or a 12.5mm Abbe ortho to something like the 12.5mm Docter UWA and you'll see what I mean.
The good news is that you can decide for yourself how much "extra" beyond just performance you want or need.
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