Do you have buyer blocks in place to stop serial pests ? At least block buyers with unpaid item strikes

using this link http://ocsnext.ebay.com.au/ocs/sr

By adding buyer requirements to your listing, you can stop members from bidding on or buying your items based on certain criteria. You can block buyers who:

• Are in countries you don't want to send items to
• Have a negative Feedback score
• Have unpaid items recorded against them
• May bid on several items and not pay for them
• Have breached eBay policies

To add buyer requirements:

1. Go to Site Preferences in My eBay.
2. In the Buyer Requirements section, click Show, and then click Edit.
3. Select your requirements, and the click Submit.

You can block certain bidders and buyers if you don't want to sell to them. They won't be able to bid on or buy your items unless you remove them from your blocked list. You can block up to 5,000 users.

To add people to your blocked list:

1. Go to the Blocked bidder list page.
2. Enter the username(s) you want to block, and then click Submit.