Make your upper limit, no limit.
Ask your loyal customers for positive comments about your products and your service. Then post these testimonials where other customers and prospects can enjoy them.
When the customer makes contact, he does not want a quote. He wants a commitment.
Sometimes we become so expert in our own domain, we forget that customers may be less familiar.
Silent customers can be deadly. Encourage them to complain.
Always be kind in your heart, spirit and mind.