>>95962107It's a matter of convenience. If you paint 1-2 Warhammer armies over the years, you need not many hobby paints anyway. Any regular 17ml dropper bottle will last forever for that purpose and you only need to replace your main colour maybe once.
Sure, if you paint excessive amounts of miniatures, some high grade acrylic might save some pennies over the long run, but compared to a single bottle of Vallejo white, it's more expensive.
As with the cheap craft paint crap: people are usually not experienced enough to really see the differences. Their hobby paint-painted minis look bad, and their craft paint-painted minis look equally bad, so they think it's the same stuff. Only with experience they will start to notice different behaviour in paint, and how it affects their paintjobs.
And don't get me wrong, artist grade stuff is good, but for the average Wargamer it is overkill.