Why would you convert to decimal naming conventions when using a binary numbering system? Or do you think numeric values like 42(dec) have inherent names? That’s as silly as thinking that the freezing point of water is 0 degrees or, even worse, 32 degrees.
The other argument I’ve heard is so that people will see how much the government is taking from them, and be angry about it. This would be particularly useful for politicians who campaign on smaller government.