My main reason to surprising is the size of the limit. For example, if a person buys a laptop that cost 2000 US, he/she must pay additional fees. Or another situation, when foreign visitors bring their stuff (e.g. MacBook Pro or photo equipment) they also must pay fees. It is weird and awful.
I am from Russia. I am not an expert in import regulations, but as I see tips for travelers, the limit is 10000 USD (50 KG) by air for personal belongings and 500 USD (it is low and it was a surprise for me) by other transports.
In general, the customs fee size in Brazil for hi-tech devices for me looks pretty outdated, because I can see that there are only a few local brands and I don't know but maybe they just use OEM devices from China. And, of course, as I understand, not anyone international computer supplier who does localize their manufacturing in Brazil.
And, as I know, many EU residents when they visit the US buying laptops and phones, because it is cheaper and more models are available :)