Because without the chocolate, it's like eating slightly burnt coffee flavoured sand. I eat them all the time because I have a fucking problem, but I don't enjoy it.
Genetic fast metaboliser of caffeine. Need more caffeine to have an effect and more prone to addiction. I decided once to drink espresso until I got the shakes. I needed 12 shots.
Eating beans seems terribly inefficient though. Eating the 30g of beans in a cup of coffee or a shot of espresso for example would be quite the snack. Water extraction of caffeine is highly efficient so you aren't leaving a lot behind from coffee / espresso either.
Have you tried Guarana pills or slow release caffeine pills? No data, but I've found Guarana to be a less jolty longer lasting than most forms of caffeine
To be clear, I'm eating them along side a quad espresso, not instead of it. Pretty sure guarana pils aren't available where I live, and the only caffeine pills available are weak and expensive.
I think you can eat the seeds and it is apparently possible to home grow guauranna (I doubt that it's particularly easy to grow though). Keep it away from pets.