Why do people who use the metric system use centimeters and meters, but not decimeters? It's the equivalent of using inches and yards, but not feet. And if you try and use a decimeter, you get looked at really strangely like you're from some other planet.
1 dm^3 = 1L. It's used often enough in chemistry. It's not like Imperial doesn't have any increments that are not used anymore. And worse, they have really stupid names.
I would guess that it's not enough of an increase in convenience size-wise to make up for the inconvenience accuracy-wise.
Or, for that matter, hectometers.
Or nanometers, micrometers, megameters, gigameters, or terameters
We use nm and um. Well, histologists, cell biologists, chemists, physicsts, electrical engineers, and the like do. As for the others, there are no scales large enough. And astronomers use light-years and parsecs, which are a bit more intuitive in that field. Note, however, they still use kilo-, mega-, and giga- prefixes.