Chris's answer is thoughtful and no doubt true, but it seems a tad too polished like it has been said many times before. Could have a negative effect. I agree with Mick in a sense about wasting words, or a least keeping it simple, like saying that price generally equates with quality of work, and a potential customer has to decide what is right for them. Give your card and leave looking like you have important things to take care of. Que sera, sera.....