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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 0.06
TRX 0.31
JST 0.061
BTC 70273.84
ETH 2144.34
USDT 1.00
SBD 0.50