I agree the price is high in a general sense, but a quality stainless steel serrated track nut with captive washers isn’t something that many manufacturers are making. More importantly, they aren’t used widely today. Yea ‘fixie’ culture may have brought some popularity back to track bikes, but track nuts are an inconsequential slice of the market compared to quick releases and thu-axles. The smaller the demand the fewer manufactured. The fewer manufactured the higher the cost, especially for quality. Seems pretty basic to me.