That's the fundamental problem. The function of the finance system in a healthy economy is to ensure efficient allocation of capital. Playing poker has a neutral to negative effect on the system.
Valuations of companies are only important to investors because of the inherent gambling. If you purchase capital at a single valuation that never rises or falls, what's the point? Even an index fund pursues gradual increases over time.
...Or am I building a strawman here? Is this not where you were going?