This makes it sound like we are prisoners to a system (and yeah, we are) but that opting out would be a one-time choice. This is too narrow a view.

Let's say you develop enough skill to opt out -- you move to unclaimed territory and feed yourself based on the local flora and fauna. You get your pound of nutrients and gallon of water that you need. You are out.

...but we're social animals. We don't deal well with "out". You'll get to discover this after a while -- or if you have a medical condition, rather dang quickly. We have easily pierced skin, no carapace, crap for hair (which is only helpful if you live along the shore and swim to get food), burn easily, get horny all the time, and really only thrive when we can cook our food and use the waste to make soap.

Humans are pack animals. To stay in the pack and not be eaten by malaria, we contribute back. We may have lost track of the scale for giving back, but we'd go nuts without it.

I have tinnitus. I can't even deal with a single minute without noise or I'll hear those high pitched whines. I have to turn on a fan in winter or I can't sleep.

You weren't born a slave -- you were born into a society. Your natural state had to be invented, but it involves concrete and a dental plan.

I mentioned before that this isn't a one-time choice. It's a lot like AA and what aerowid said: each morning you wake up and choose not to flee. Should you flee, you are 99.5% genetically likely to come back -- even if it's just to avoid roaming charges. If you don't come back, you're out of the gene pool and more of us suckers will be born.