Which 20 coffees? 20 Starbucks coffees? 20 no-name donut shop coffees? 20 instant-scoop grocery store coffees? If coffees are to become a bona fide currency, we're going to need more precise denominations here.
Or hopefully we can just stop with the coffee-pricing analogies because it's getting ridiculous and your would-be customers think you sound ridiculous. It's outdated sales-talk.
The first Google hit for "Junglekeepers Charity Rating" brings up this link claiming they are a scam:
https://www.complaintsboard.com/junglekeepers-scam-charity-c...
This non-profit is not a scam. They have done some well documented work to protect the Las Piedras Region, they are running a ranger program covering 55,000+ acres of rainforest working with the local communities and have partner with established philanthropies. See for instance the involvement of Age Of Union: https://www.ageofunion.com/feature/film-the-heart-of-a-missi... or some of the features about the work on ABC: https://youtu.be/8FAbqkaI9HY
Criticism is useful, but perhaps researching thoroughly before make wild claims like these can help. I invite people to do their own research.
¯\_(ツ)_/¯
your move
That'd be extremely expensive for a normal coffee, even at 2023 prices and assuming some rip-off place like Starbucks or quite-fancy cafes that actually put some of the high price into getting excellent beans. It's unthinkably high for home-made coffee. You can get extremely nice beans and not hit $2/coffee.
$5 is close to the cost of a hot caffeinated milkshake, though.