Also, I was there around 10 years ago, so it may have changed, but back then tourists didn't really go "under/inside" the tree, they were mostly outside the lot, maybe to preserve the tree and avoid possible damage/diseases.
In general people who harvest cashew fruit wear lots of protective clothing.
Also, fun fact, the seeds need to be heated before being eaten. There are no truly "raw" cashews at your grocery.
There must be enough chemical differences to cause different effects. Whew.
Edit: Those were raw mangos.
5.3.2 The exceptions to this are when Federal, State or local regulations legally require an ingredient or the entire food item to be heated at or above 212F. A regulatory exemption to the temperature treatment threshold does not impact the Bioavailability score (see 6.0 below).
Looks like you've been spending $18 per jar of cashew butter for no reason. The first result for "how to harvest cashews" says "roast the nuts at 350-400 F. (230-260 C.) for 10-20 minutes" to deactivate the urushiol. Not very raw.
and it notes that
> People vary greatly in their sensitivity to urushiol. In approximately 15% to 30% of people, urushiol does not trigger an immune system response, while at least 25% of people have a very strong immune response resulting in severe symptoms.
I've also heard this about poison ivy. (I assume cashew plants have less of this irritant than poison ivy does.)
But it also varies a lot among people. My wife has no issues eating/handling mangoes but her twin sister has horrible allergic reactions.
Often subsequent reactions are worse than the initial.
Like most allergens, people have very different reactions to it and can grow tolerance over time with exposure.
The same happens with some banyan trees, in a big way.
 See section "List of historical banyan trees" at above link, and link below.
Also, interestingly (from first link):
' Older banyan trees are characterized by aerial prop roots that mature into thick, woody trunks, which can become indistinguishable from the primary trunk with age. Old trees can spread laterally by using these prop roots to grow over a wide area. In some species, the prop roots develop over a considerable area that resembles a grove of trees, with every trunk connected directly or indirectly to the primary trunk. The topology of this massive root system inspired the name of the hierarchical computer network operating system "Banyan VINES" '. VINES had directory services before Novell Netware and Microsoft did, and was widely used (pun intended) for a while.
- Most Americans & Canadians are completely unaware of the fruit. Some Brazilians are unaware of the nut. I met at least a couple Brazilians (in Sao Paulo and another region that don't have cashew trees) who've eaten the fruit but have never had cashew nuts and didn't even know about the nut!
- All this tasty fruit exists above the nut, but--as far as I can tell--no effort is make to export the fruit. It might the problem of creating a market for a new product, or maybe the fruit doesn't travel well. Cashew juice is widely available in Brazil, but I wonder if most of the fruit goes to waste?
- Cashew nuts and ironically Brazil nuts are quite pricey in Brazil (at least in Sao Paulo). My thinking is that cashews are perceived as a rich person's snack in Brazil and priced accordingly. This leads to the circular problem that ordinary Brazilians don't eat many cashew nuts because it's expensive, so the domestic market for them stays small and for the affluent.
I got in trouble in first grade in Rio de Janeiro (Our Lady of Mercy school). I didn't understand the concept of having to "stay inside the premises". For the first few days I wandered, unknowingly, outside the lower-elementary area, outside the upper-elementary area, outside the high school area. I found the street vendor and bought a hot dog and a "refresco de caju" (cashew drink) those first several days. A nun caught my innocent act and no more hot dogs and caju for lunch.
From Wikipedia: "Cashew nuts are more widely traded than cashew fruits, because the fruit, unlike the nut, is easily bruised and has a very limited shelf life." -- https://en.wikipedia.org/wiki/Cashew
Caju nuts I'm assuming are expensive because they are mostly exported. It's probably the same as arabica coffee in Colombia, it's too good to consume domestically.
Caju fruit you're probably right, does not travel well. Same as açaí, that won't go far without refrigeration or freezing.
This is expensive. R$50 buys you over two pounds of expensive beef cuts.