The answer to this is very simple: none of your business.
I take strong issue with the word "need." Why do you need that car? That television? That four bedroom house? Why do you need that bow and arrow? For sport, you say? Why not play some ball game instead? Why do you need a chess set when you can play digitally online without killing a tree? Why do you need those fancy clothes? Why does your family need that Disney World vacation?
Let's limit your life choices to what someone else decides that you "need" and then ask if life is still worth living.
The fact is that freedom and liberty comes with it the ability to not have to explain or justify our life choices to others. Will bad people abuse it and do things you don't like? Yeah. That's the risk that comes with it and we have a legal system to identify and deal with those bad actors. A legal system that ought to exist to serve and promote liberty for the innocent, rather than eliminating it and destroying it for everyone out of fear and suspicion that some people might be up to no good some of the time.
So unless there is evidence of wrong-doing, it really is no one's business who they associate with, who they trade with, what they trade, how much they trade and why. And "need" has absolutely no relevance. "Because I want to" ought to be good enough.