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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 0.15
TRX 0.23
JST 0.032
BTC 84591.55
ETH 2182.56
USDT 1.00
SBD 0.67