A couple of other rules I have with eBay sellers:
If you ask a question and the seller can't be bothered to respond, avoid.
When considering a pipe on eBay, I want to see clear pictures of the "business" areas of the pipe, the rim, the bit, and the slot, in addition to any other pictures. If they're not in the listing and the seller isn't willing to post them when asked, I don't bid.
I'll also ask if there is any evidence of crazing, or splits in the chamber walls. With older estates such issues are always a possibility.
If you ask a question and the seller can't be bothered to respond, avoid.
When considering a pipe on eBay, I want to see clear pictures of the "business" areas of the pipe, the rim, the bit, and the slot, in addition to any other pictures. If they're not in the listing and the seller isn't willing to post them when asked, I don't bid.
I'll also ask if there is any evidence of crazing, or splits in the chamber walls. With older estates such issues are always a possibility.