No Utility = Minimum USD/HIVE Trade Value
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As you said they peak early on and then fade. The owners not doing much with them but being content with the supply increasing with no use case other than being a token for said tag and/or community. It is possible if/when the Hive Blockchain attracts more users we see the community tokens move up in value as some of those users might gravitate to and purchase 2nd layer tokens.