I am intrigued by Abra (https://www.goabra.com) and the potential returns for the Nu network, if they were using the stable NBT.
They apparently use tellers (bitcoin traders?) in this way:
Users deposit funds via a linked bank account or through Abra’s network of “Tellers.” Tellers are super-users who charge a fee to receive a user’s cash deposit and credit the user’s Abra account with the digital funds. Tellers can also reverse the process, selling paper currency to users in return for Abra’s digital cash.
The app, according to TechCrunch, converts funds to bitcoin upon deposit but shows the balance to the user in fiat currency. The bitcoin is stored on the user’s device, thus avoiding the need to comply with money transmission regulations. Use of the service, however, does not require any specialized knowledge of bitcoin or the blockchain.
Source: http://www.bitcoin.name/2015/09/blockchain-remittance-service-abra-closes-on-12-million-in-funding/