A friend of mine sometimes goes to the US, buys some nice used guitars that he knows are of good value, and sells them when he returns to Brazil, and usually it

A friend of mine sometimes goes to the US, buys some nice used guitars that he knows are of good value, and sells them when he returns to Brazil, and usually it pays for the trip. forgot to add: I almost never buy my computer/electronic stuff here. I just order online from the US and sometimes pay customs (it's still cheaper most of the time)