Why are our customers asking us if we are ISO Certified?

We only distribute products made by other manufacturers? Literally, we buy products in bulk, separate into individual packages and then ship them out.
Why are our customers asking us if we are ISO Certified?
Most people are referring to ISO 9001:2008 Certification when they ask, “are you ISO Certified?”
Here are some easy answers to the questions about ISO 9001:2008 Certification.
(1) We want our order done right the first time so we can provide our customer’s order right the first time.
(2) We want a third party (certification body) to confirm in writing that you are doing what you say you will do.
(3) We want our customers to get products with the highest level of quality assurance.
(4) We don’t want to have the expense of auditing our supplier’s quality system.