There is a point where finacially it just doesn't make sense to make really low capacity products. Think about SSD's it financially doesn't make sense to even make them. Take these 2 harddrives for example. The 120GB drive is only $3 cheaper to buy . 60GB SSDs used to be common now they don't even exist on many websites unless they are old inventory.
Same thing is happening with the cheaper power supplies and certain wattages. The price difference between a lot of 400W vs 600W power supplies might only be $20 for some brands. At that point, printing, advertising, manufacturing, storage, shipping, inventory doesn't make sense for the difference in price. Might as well only sell the 600W model and dump the 400W variant.
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