The difference here is reliability. Commodity kit is generally reliable, just slower; whereas cheap 3d printers are more likely to fail a print/produce junk.
There is a solution to that, when your labor and capital costs are huge but the cheap printer is 1/10th the cost of the fancy printer... simply install and use 3, 4, maybe 5 cheap printers, keep the best print, and pocket the savings.
Not sure where the break-even point is, but the cost of a failed print is pretty high in terms of sunk time for most prints. On an industrial scale, a machine that prints correctly 99% of the time might be a better investment than two that print say 75% of the time.