Me: Hey do we have more of these 400 count card boxes downstairs?

Brother: Why?

Me: Because I'm about to buy 6 of them? (Total cost $4.81)

Brother: You know you could use thet money to pay off your [debt]. (Redacted debt source)

Me: I'm buying them to sell magic cards so I have money.

Brother: Mmhmm

Me: Maybe you should keep your nose out of others people's business.

Brother: Glares at me and leaves the room

Like... Am I wrong here?