It seems like every practitioners goal should be black belt, but what if this wasn't your goal.

Then it's not your goal, I guess? Don't see what you're getting at.

Is it worth it dealing with the injuries and the risk of losing your job, because you need a few days off because your back is fucked up?

You need a better job. But really, injuries like that are pretty rare.

Or dealing with your local gym yokels who just can't come to grips with the concept that presenting an image of invincibility and actual development of skill do not go hand in hand?

Considering that the vast majority of people here do BJJ on an ongoing basis, it's safe to assume that yes, we think it's worth it. No, not everyone you train with will be an ideal training partner. The solution is to tap.

So there is this popular thought of BJJ being a vehicle for spiritual growth, but why should that matter when the only thing that matters in modern society is maintaining a false bravado of everything is fine?

This is a bizarre statement which isn't remotely factual.

I mean I can fake it until I make it, because perception is everything.

You haven't actually said what your goals are. Fake what?

So please convince me and other people why we should take the risk in trusting you to learn this thing called BJJ.

The risk is commensurate with any other physical sport or activity. Having seen the litany of injuries my friends who are into basketball/tennis/etc. have received, I'd venture to say that BJJ is probably on the low side of the risk scale, but I have no data to back this up. Injury rates are also dependent on how you choose to train.

Is it even worth the $100 a month?

Depends on your specific financial/life situation.