I hold a good stake od SPORTS too. I think I am Understanding that as the price of the token increase, the upvote amount will have to decrease to avoid inflation.
2 months ago, 1 SPORTS was valued at 0.0006 STEEM. But now, SPORTS have grown to 0.0015 Steem.
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So, that's a big priblem of those tokens. Seeing the price decreasing so fast, it's hard to make people trust in the system and to stake more.