I think it is mandatory by the law.
Speedo must show a little more speed.
Imagine who will be responsible in case of accident due to too high real speed but speedo showing less...
They choose a setting which shows more than real speed.
GSMarc from BELGIUM
2014 KTM EXC450 6Days
2008 HP2/MM ABS
2000 R1150GS (fortunately sold)