sherco.
understand what your saying and its a good idea, but the 10% off is to encourage customers to ring in the first place.
i'm doing 10% for everyone, my thinking is, if an old person see's 10% off for oaps she'll go for it just as much as 10% off for anyone, if your trying to encourage people to phone then why alienate the rest of society.
just my way of thinking, be it right or wrong, its an option to mull over.
derek