I think it depends on where you are from and coming from, to be honest with you.
I have always entered BA with luggage on the heavy side, and an amount that would obviously stand out as being a lot for just 1 traveller.
I think some Aduana officers must feel that if you are North American or European, you are probably visiting Argentina on a holiday and aren´t bringing anything questionable in with the intent of leaving it in the country.
The poor Argentine guy infront of me going through Aduana was stopped on about $1,000 worth of skateboarding stuff and 1 Ipad, whereas I had 3 enormous rollerboard suitcases with me, in addition to my carry-on duffel, the Aduana guy glanced at them and said, ¨That is a lot of stuff for 1 person.¨ I smiled back weakly, but he let me pass without so much as opening them or asking any further questions.
Similar scenarios have happened to me, including the one where I was asked, ¨That´s a lot of stuff, are you planning on moving to BA?¨ I honestly responded that yes, I was, and he merely laughed back, I dont think he believed me, and waved me on in.
I really believe that if they are in the mindset that you are entering with the intent of leaving with the stuff that you came in with, and arent going to drop off any Ipads to anyone, they will let you slide.