Often, the only reason you wouldn't choose, say, stainless steel over regular steel, or UV-resistant polycarbonate over ordinary polycarbonate, is because of th

Often, the only reason you wouldn't choose, say, stainless steel over regular steel, or UV-resistant polycarbonate over ordinary polycarbonate, is because of the expectation that one is cheaper. So price can't be so unimportant. And one version always is cheaper, sometimes by a factor of five or ten times. But sometimes there are surprises and the stainless version is cheaper for other reasons. Maybe the non-stainless bars of that particular size are only available with super tight tolerances, for example. So why force the customer to know and guess which material grade they want as a proxy for price, when you can directly let them find the selection that meets their needs at the lowest price?