I don't mind people making presets for self-usage, but selling it, to me, is quite a silly way of getting easy deviantArt points as the minor edits give little to no credit to yourself compared to the credit that should be given to the makers of the original mass markings. I have no doubt that the original makers would also be quite irritated to see their work used and not given any sort of mention whatsoever and the preset maker creates the impression that they are taking the credit for themselves; I for one would definitely not be too happy about my work being used to save time and effort for others' preset work.
I wouldn't go as far as disliking them for it, but it is basic cheating. Although, I haven't seen anything from the original mass markings creator saying that there is no permission given to use the markings, unless I am mistaken and just haven't seen it at all throughout my research.
I do prefer seeing preset-makers providing their viewers with their own time, effort and markings rather than using someone else's as a way of quickly making a preset to show off, but I do not control what they do and never will have any sort of power to do so. Selling the presets though, and for quite a high amount of deviantArt points, rather puts me off of ever considering buying a preset off of them as I'd be unsure what markings they used off of someone else; but I'll always appreciate the actual design and the choice of colours.