Why your computer turn it off every time?

1.) Even with a surge protector, there will be micro-surges of voltage that will scramble the data on your hard drive.

2.) Memory fragmentation. This is not the same thing as disk fragmentation. Your computer allocates memory to programs that are no longer in use. If your computer is on for days or weeks, it is holding ram in reserve for something you used last week, and now you don't have enough to run your programs. Turning it off clears the slate for the next time.

3.) Mechanical parts like the spinning hard drive wear out prematurely.

4.) Waste of electricity -- dummy!