Seriously? This idea was horrible back when Coinlab tried it in 2012 ( http://bitcoinmagazine.com/1086/bitcoin-mining-a-new-means-o... ) and it's even more horrible now. At the very least mine Litecoin or Primecoin.
[1] http://en.wikipedia.org/wiki/List_of_cryptocurrencies
[2] https://en.bitcoin.it/wiki/List_of_alternative_cryptocurrenc...
Ripple/Opencoin has 10x the market cap of Litecoin: http://coinmarketcap.com/ripple.html
But Ripple isn't a typical open source "crypto-currency". It's well financed and backed by big SF investors with the intention of making the founders/investors money, instead of miners, as the currency scales in price.