I am well aware that the Magni / Modi are absolute entry-level. But people have been saying (here, Amazon, and several other places) that the value is nearly unprecedented. I figured this was a reasonable place to start, and I think it was very fair to expect some kind of perceptible improvement in going from paying $0 to paying ~$200. (I would expect less if I went from $200 to $1000). If a curious consumer doesn't feel a beneficial experience from a safe first investment, they probably won't bother investing again.
Had you been listening to some onboard Realtek HD audio that are common place on PC motherboards, and had you been using some higher impedence and/or power hungry cans, I'm sure you'd notice a major difference between the two.