Not everyone is willing to invest thousands of dollars.
Many people are not even able to. Nowadays my total income is approximately $470 USD per month, and the local minimum wage is approximately $550 USD per month. And there are many people, who live (or rather survive) with much less income. So actually a lot of people are unable to invest thousands of dollars into a game.
RE: Splinterlands Strategies: Buy Summoners before it's Too Late!