I don’t know how to encourage investment without the stock market

I invest in stuff that's not stocks all the time. When I give money to someone so that they will hopefully create a cool new product in the future (e.g. a video), I'm not paying for an individual product, I'm investing in them as a creator in hopes for future ROI. That's Patreon.

We treat the addiction to wealth accrual different from any other addiction, in that we laud it, but make no mistake that it is addictive. Watching numbers in your account go up gives you a rush, just as sure as watching numbers in a video game.

When other addictions cause harm, we push people to get treatment, or at very least condemn the addiction. When someone is addicted to the accrual of wealth, even to the detriment of others, we call them, 'genius', 'savvy', 'visionary', or 'shrewd'.