Steem is the basis for everything that happens on the chain. I'm powering up on pal and sports as well but neither of them has the same utility as steem will in the future.
I think that they can be a big opportunity in their own right in the future as people join the tribes rather than through steemit but at the end of the day any profit made will be through steem. It is what you need to operate on here and what all the tokens are traded against.
Future users might only earn fractions of steem and lots of engine tokens but the profit will be made by the steem holders. The other tokens will be more about utility than making money. Good for using the tribes and getting their benifits but will be traded back to steem if they want to spend it.
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