There is no place among the rules that guides this forum, that is stated that someone who is found of doing this, is going against the rules. It is clearly stated that having multiple accounts is allowed.
Who said those suspect are included on forum rules? it's handled case by case, similar like how reported post will be market either good, bad or soft-bad since it depends on the moderator decision.
The forum rules doesn't include if two user using same Bitcoin address are indeed controlled by one person, but anyone who understand Bitcoin will know if it's definitely controlled by one person. Can you imagine if forum rules will state how to catch multiple accounts? of course everyone will learn to find another way in order to evade from that's rules, not all rules should be written!
@OP seems have many accounts in this forum that the sole purpose is to milking this forum
Low quality posts or abuse of trust?