Imagine you start an asteroid mining company. It's tough at first. You know that profits are uncertain and, if they do ever materialize, it will be in five years at the earliest, maybe even ten. It takes a long time to find investors willing to trust you because several similar ventures with almost identical business models have already gone bust and the investment horizon is far too long for many. Nevertheless, you persevere, and you manage to convince a few investors.
You hire astronomers to identify asteroids with valuable metals such as platinum. You send unmanned probes to several near-Earth asteroids to collect samples. The first few turn out to be of little value. The costs are too high and outweigh any potential profits.
