The exchange rates vary. They may be using something else to price the steem and likewise the bitcoin may be priced differently... For example I use bitstamp.net and many others may use something else and there are some differences.
Check Coinmarketcap.com and do the math and see if it gives you a similar number or the 166 steem for 1 btc?
I get $653/$3.71 = 176 Steem according to coinmarketcap.com
I think its close enough, again depends on what exchanges they are pricing steem and btc.
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Wouldn't they go by what the price is on their buy and sell page? Right now it's at 3.40. 2 days ago steem was at 2.97 on their page and Bitcoin was like $666 and it was well over $100 usd difference.
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