Most people aren't thinking about what you want. No, really. It's not that they don't care about you, or don't like what you do. It's that they're busy. Like you. Or preoccupied. Like you. Or in their own private Idaho. (Maybe also like you.)
If you want people to do something, it's good to ask. In big letters. Right up front.
The BBPiT reports that tips are up since we made this sign for him. He lights it with a little battery-powered lamp, sets it up right in front of the band. People are happy to oblige.
When you want something, don't assume people can read your mind. Ask.