It's not just a matter of not understanding, it's also the tendency to assume the default, which is a linear scale. One suggestion would be to make the logarit

It's not just a matter of not understanding, it's also the tendency to assume the default, which is a linear scale. One suggestion would be to make the logarithmic scale super-obvious and in your face. "1 10 100 1k 10k 100k" in small print obscures the unusual nature of the scale. Instead, show 1 10 100 1000 10000 100000 and show those numbers in a large bold font so that they are the most noticeable feature of the graph. (Possibly use an increasing font size.)