Sign in yard - yes - obviously
Photographer to take pictures - I take my own, but if I hired someone I would be there to let them in.
Turn on lights etc - you think your agent is just sitting around with nothing else to do. Maybe sometimes but to think every time - no. I am a big boy and can turn lights on for my buyers.
12 hrs notice - sometimes, but would you really tell the buyers agent to not show the house because they gave 6 hrs notice or 30 min notice? I had an agent call me at 10:30am today to show a house at noon. It happens and I said yes.
If it's a $1.5 mil oceanfront vs a $75,000 split foyer it could make a difference to an agent what they will drop to go open blinds.