Xemnas, I had not seen this happen, you are right it seems vague and its unsure whether he is buying or being given gifts, so I would not suspend him without first trying to establish which it is. Was this long ago? What thread was this in?
Regarding giving it away versus selling, there is a huge difference that I think you are missing out. When someone gives dmt away, they will usually do it because they saw how powerful an experience it is, and they want others to experience it. This means they will also know how it needs to be respected and used only in specific situations and so on. So giving will usually come accompanied by a propper introduction, talking about set and setting, smoking methods, etc. Also this will usually be done with close friends, not with unknown people, so chances of legal problems are even less.
With someone selling, on the other hand, their main motivation is money, so it wont matter so much who it is for. It might be a friend of a friend of a friend that you've never met who's gonna use it, maybe this person has psychiatric problems or does it in an unsafe setting, but since this person is selling, as soon as the money comes in and the dmt goes out, the relationship is "finished", so to say, its as if its not their responsibility anymore. But what if the person who smokes dmt freaks out, goes to the hospital in a bad trip, the police asks questions, then there are way bigger chances it goes back to whoever sold it. Or other similar scenarios... Im sure you can see the difference.
So when we talk about giving away, we also make sure to establish that it isnt indiscriminately giving it away, but rather introducing people directly, showing them the key aspects of preparation, usage and integration, etc etc. This way not only it diminishes problems with the law, but it helps building up a network of people who are respectful and careful about this substance.