|I turn it off to save the planet a bit. Each watt you burn you also kill some animal. |
On top of that I am a cheapskate. I don't want to spend my hard earned money on electricity.
Lastly is the chance of a voltage spike or such that could not only damage my goods but could cause a fire or shock anyone beside the system. It is not a 100% foolproof system but I have used a watt meter on a typical home setup. 35 or so watts are being burned in standby or off state. That adds up to a lot of electricity 24/7.
It is really simple to turn it off or get lazy like StuartS and get an automatic switch.
A power spike or power drop or a power cycle(hertz) variation can cause damage in any country. Power companies have been known to drop frequency to help reduce loads in summer and winter. They have also been known to do rolling blackouts since they know a certain amount off stuff will not turn back on.
1/3 of highway deaths are caused by drunks. The rest are by people who can't drive any better than a drunk.