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I don't think that's a reasonable concern. The problem isn't people selling. The problem is people wanting to sell.

Flip it around: If you have people who want to sell their HIVE but can't, do you believe they are going to be good participants in governance or curation? If they want to sell, the problem has already occurred imo.

We each have our own motivations. Have to make Hive a platform people want to keep a stake in. Not always easy, but worth trying.