Muni-bond ETFs are multiplying like rabbits but will they ever catch on with retail investors? The Wall Street Journal's Michael Pollack poses that question in today's Fund Track column. Van Eck, Barclays Global Investors, SSgA and PowerShares all offer muni-bond ETFs already, while Vanguard Group is planning such offerings, Pollock wrote. Muni bonds may always have more of an appeal to institutions, he wrote, because institutions tend to make larger trades and play the market in a more active manner. Individuals may not be so interested in the muni ETFs because they trade often, which means brokerage fees may cut into the fund's returns.  

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