This is a thing in Germany, e.g. one large grocery chain sells "premium" tomatos for prices like "1.99€/100g", which makes intuitive comparison hard for some, especially because those who look for prices per mass usually compare kilo prices, and most are just used to 200g or 350g trays, sometimes a pound, not comparing prices per weight at all.
And when you see 0.99 €/gram ? :)