We used to do packs that were exactly enough for a 10 cup pot of coffee (rip open bag, dump it in your filter, flip the power switch, done), but the packaging ended up getting so expensive that I couldn't justify charging as much as I'd have to for that. (Looks at price per pound of coffee in K cups, maybe people wouldn't care after all)
Plus now I get the sense that there are more people using 12 cup or 4 cup brewers (where a cup is obviously 5 fluid ounces because USA, USA). 10 cup is still common, but it's no longer as ubiquitous as it once was.