As I said I leave feedback for all my buyers - including those that don't pay,

To be in breach of ebay policy regarding "negative" comments with postive rating for buyers -

1. the non paying, contract breaker, $$$ and time wasting buyer must report the comment

2.  the comment must be viewed by ebay as being "sufficiently negative to warrant removal"

3. the ebay rep removing the comment must determine a policy breach has occured and advise seller of violation.

Accusing others of breaching policy that you clearly have little understanding of is one thing, but to state that such sellers, like myself, are "untrustworthy" because they have left honest comment that may or may not breach policy and may or may not be reported is a giant leap and accusation to make IMO.