We do not care if your billing and shipping address do not match. However, we do reserve the right to insist they do if we suspect fraud, or if your order comes from a high risk area such as TX, FL. If you are contacted about this issue, please understand that we have had a lot of fraud from those states. To protect our product pricing we need to keep fraud to a minimum. It is nothing personal.
If you are a Paypal user you may find that Paypal does care if they match (it depends on how you have your PP account set up). If you are running into trouble with Paypal you may want to choose the regular checkout button and select another form of payment.