YOU MATE, STOP NOW BECAUSE I SAY SO! YOU WILL HAVE A PICTURE WITH ME AND YOU WILL SMILE!!!
Joking aside though it would do my head in people asking me to stop for a picture/autograph every 5 minutes every time I popped into town, hense why I would feel shit asking. I know it comes with the territory, but you can hardly be expected to politely accept/reject everyone, sometimes you'll just have to go "here mate i'm in a hurry". It's nothing personal.