Looks like it's only in the frame of a suggestion... Since you can list with said 'unpleasantness'. If you really don't like it, sell you things somewhere else, where you like the policies and their suggestions. I can understand why they suggest these things... Every user is supposed to read up on and agree to policy within eBay and follow TOS as a contract. Dispute arbitration covers all such things, no real need to reiterate it in every one of your auction/sale listings. Saying that you require payment within a time frame is one thing, saying that you'll file a dispute if policy (yours or eBays) is breached is fairly obvious.