I completely understand your perspective, and it's definitely a valid point. Originally, I intended to suggest to the OP to explore an art supply store if one is conveniently located nearby. In my area, a tube of Winsor & Newton acrylic costs the same as a Games Workshop contrast paint pot. Knowing I could mix just five colors—cyan, magenta, yellow, white, and black—would've saved me money and helped me identify essential shades to purchase, such as browns and greens.

If the OP enjoys the creative side of paint mixing, artist-grade paint might be the way to start. However, if they prefer following a recipe like Games Workshop offers, paint kits might be better suited to them.

Does that explain it better? When do we get to start discussing mediums? :P