To "PMSL"
Yes a "non Serviced" lasting 13 yrs on one hand looks better than a "Serviced".
However anything worth keeping should be looked after.
Do you not have tools you service? Your computer/laptop, do you never clean that out and run "Service programs" ?
Then again you probably have a yale alarm, and use a 3 lever lock on your front foor
PMSL
Alarm, October 2013