Is there any sense of buying tokens except speculation?
For example: if you are buying shares - you receive profit on them, also you can sell them later
If you are buying or joining in ico and that was becoming pure speculation about the future of the project itself. But if you are choosing promising altcoin just like POS coin and you will be able to get passive income and you can sell them all later. But that depends on the result of your analyzation and the criteria of your coin itself.