I will continue to red-tag users who send merits to their own alts. Beyond that I don't consider merely sending or receiving merits (without proof that the users are connected) as evidence of wrongdoing, even if it's large amounts / shitty posts / etc.
Not sure if theymos will kick me out of DT for that but I have a feeling that his statement was more applicable to someone red-tagging a merit source rather than merit abuse in general.