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It's a GUI thing. Every account can set voting weight per vote. However, if the output of vote value is too small in shares, then the blockchain doesn't accept it. (Vote dust)

Ah! Awesome do you know precise value? I assume it to be $0.1 or $0.2 ; Also do you know whether the GUI slider on busy is then working for all users (<500SP)

PS: I've sent msg request on discord pls do get back to me

The one on utopian works for all users.