Well, that's not an accurate description of CoinJar's business model.
CoinJar is Australia's first VC-backed Bitcoin startup. We aim to bridge the divide between fiat and digital currency. Besides CoinJar Filler, which becomes extremely popular today on Twitter and Reddit among Australian Bitcoiners, we also have a wallet service and a merchant solution, with a well-designed iPhone app coming soon.
As of today we already have 90+ wallets and 10+ merchants signed up. Soon you will start to see payment pages powered by CoinJar Checkout around the Internet. (FWIW, CoinJar Checkout has a PayPal-compatible API! Just change the endpoint of your PayPal plugin and ready to go.)