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That would be a 2.4 billion dollar marketcap if STEEM hit $10 per token. Not likely anytime soon: http://coinmarketcap.com/currencies/steem/ Ethereum has never even hit 2 billion yet.

Say how does a normal user get a hold of ethereum without purchasing them from an exchange?

If you have Bitcoin you can use shapeshift, or another way is get a Coinbase account and buy ETH with your bank account.

Coin Marketplace

STEEM 0.18
TRX 0.16
JST 0.030
BTC 65668.23
ETH 2619.57
USDT 1.00
SBD 2.65