lol, i leave mine on. I get new ones from my dad reguarly because when he is editing pictures, the colours need to be perfect and sometimes they go, so at the mo im on a 22" Apple monitor on my pc!
I don't bother to turn off my monitor when I shut down my PC. When the PC is off, the monitor goes into Standby or whatever term your monitor uses. I use my PC a lot so I never bother to push the power button.