UBank deposits average $40k 28 October 2010 6:04PM NAB provided a couple of data points on its two-year-old UBank business yesterday. Deposit balances now exceed $5 billion and customer numbers exceed 125,000.UBank was "a key contributor" to the retail bank's growth in household deposits, NAB said, in commentary published with its financial statements.Whether UBank is making a profit is less clear.Mark Joiner, executive director of finance told the investor briefing yesterday that "it is a high margin, low cost offering, but it's in line with the marginal cost of funds in wholesale areas and in term deposits. "While it's making a contribution to our liquidity, at the same time we're building a franchise."UBank plans to introduce a home loan product "before the end of 2010", Cameron Clyne, the bank's managing director, told the briefing. In the meantime, one part of NAB's customer base may be receiving a decent yield and possibly better service through UBank, but other customers are being left behind.The bank lifted the level of deposits earning no interest in Australia by $2.6 billion to $13.7 billion over the year.