When a figment of the imagination is substituted for material assets, unlimited acquisition and accumulation become possible because there are no natural limits. For that matter, it is not possible to limit a figment of the imagination, especially not by restricting its physical representation. Substitutes are also in infinite supply.
So, the only remaining question is why an idea (figment of the imagination) is so difficult to understand (comprehend). Is it just because there is nothing to grab a hold of? The immaterial is impossible to grasp.