If you plan to open a grocery store, the first question that comes to your mind:
How much does it generate daily?
You should ask the same question when you think of investing in a cryptocurrency linked to a blockchain network.
Why is it important to know how much the network generates?
Because the network that charges fees from people means:
It has actual movement and activity.
It has projects that are actually working on it, not just talk and marketing.
This means the team is actively developing the system instead of just selling you a dream for the currency itself.