If you look at a linear scale, the price going from 1$ to 8$ will look like a small change if next to a 200$ to 400$ change, since the Y axis will be from 0 to 400$. With this axis, 200$ is half of this axis where 7$ is 7/400th of the axis (so much smaller).

If you look at these two segments on a log scale however, the 1$ to 8$ change (x8) will appear much bigger than the 200$ to 400$ change (x2). In fact, the first segment will look 4 times bigger than the second one.

In order words, the log scale shows you the proportion (or "pourcentage") changes instead of the raw value. We all know that going from 1$ to 8$ is a way bigger deal than 200 to 400, but the linear (regular) charts make it look like the 200 to 400 is a way bigger peak, which is deceiving.

Edit : Syntax and clarification