Commentary Topic from greenfaucet
When the investing public has little interest in a particular exchange-traded vehicle, the company sponsoring the ETF may be forced to close the fund. And while you’re not at risk of losing an entire investment, you may not get an adequate liquidation price for having participated.
The essential issue is thinly traded volume; that is, the difference between the asking price and the bid price may be so wide, it becomes prohibitive to buy or sell.