Im really not see any wrong if i sent my smerits to another community member if i know him and if here not any scam actions from his side.
Please read the rules mate. It's a community driven by some set of rules. You need to respect the rules instead of creating your own.
Make sure you screenshot all these users' merit pages. I see those exchanges happened at the end of January not long after the Merit system introduced. 120 days gone since the merit system was introduced so those transactions will disappear and you will lose the proofs. I created a topic asking for DT members attention. Already mentioned your investigations. Hope DT will have a look inside.