Princess falls into the catergory of "scammer", too! I didn't want to give her the wrong idea by not treating her so I would when she first started this. Then I stopped, just saying "you didn't go potty" in a matter of fact voice. She's not on treats now, but she eats praise up just the same.
Her new scam is to have me check the pad & when I turn around she's standing there with a toy...I guess she doesn't have a problem asking for anything!