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It varies depending on STEEM/SBD market prices, but currently each share get's a weekly upvote value of roughly 0.04 UI value, which is a little more than $0.06 USD.

Coin Marketplace

STEEM 0.17
TRX 0.22
JST 0.033
BTC 97647.35
ETH 2869.44
SBD 3.66