Because.......
Say a team is close to the playoff positions into the premier league, but have money woes...
What is to stop them from not declaring admin until after all the playoffs are completed in the hope that they get promotion and thus the extra cash to 'save' them, or not get promotion and declare admin to wipe out all the debts and start all over again....
Doing that they would then get the -10 at the very end of the season, which might possibly have dropped them out of the playoff places anyway, and thus not only do they technically not really get a punishment, but they deprive someone else of a playoff chance :smt102