Invest!

"Host, the earnings of these businesses do not count as money earned from the items of the system. The squandering value comes from the buildings and businesses itself, whether they make money or not all depends on the ability of the host and the one that the hosts appoints to manage these businesses. This is all about the ability of the host and is unrelated to the system."

It was a long explanation, but I was able to catch the main points.

First, since it was only money, the only thing that could be considered gained was the properties of the businesses that I bought. But since they weren't from the system, they couldn't be considered items from the system.

Only the money itself was the item of the system, but it was impossible to earn money from money unless one was scamming people.