Well, in BitShares, witnesses not only need to produce blocks but also provide reliable and accurate price feeds for bitassets like bitUSD, bitCNY, bitGOLD, bitSILVER, and others ... also there hasn't been alot of competition for a witness slot lately which I personally would like to see changed.
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I am using Blockpay and Smart Coin Wallet.
There seems to be no reason for the shopkeeper to refuse the blockpay. This is especially true when paying with Smart Coin.
BitShare is going to be the winner of virtual currency.