@John *******
Ok so you can read but cannot understand what the risk is which which is explained on the Overstay Form (number 27 in the list) you sign at some Immigration Offices when you get your extension. "In the case that the alien is apprehended
Overstay for less than one year
forbidden from entering the kingdon for 5 years".
Go on overstay for as little as one day and if you get stopped in a police checkpoint or bar raid and asked to produce your passport (a low risk but still a risk) then the above applies. 5 years blacklisted, simple enough for you?