https://investigations.peta.org/monkeys-abused-coconut-milk/
https://investigations.peta.org/monkeys-abused-coconut-milk/
According to https://www.wfft.org/wildlife-general/a-growing-trade-monkey... monkeys cost between $1000-$4000/head
Also do note that monkey based coconut picking is on the decline: https://www.pri.org/stories/2020-08-26/does-thailand-have-mo... Only a small proportion of coconuts are actually picked by monkeys.
Another cost farmers will likely look at is the cost of a monkey handler, which are widespread vs the cost of a specialised employee who can operate a robot. Unfortunately, the monkey handler is likely cheaper.
This isn't intended as a 'gotcha', everyone has a line. Given that you're willing to quote PETA without spitting on the ground, I'd infer that you are far into the animal rights, militant vegan camp? Is that fair?