Osho67 - OEF looks like a particularly illiquid contract. Open interest for the near month ATM calls (Feb 57 calls) is only 1512, compared to the near month ATM calls on the QQQ (Feb 37 calls)with open interest of 188,458.
The puts are even worse. Open interest of just 12 on the Feb ATM 57 puts for the OEF compared to 340,380 for the ATM feb 37 puts for QQQ.
If you hold contracts for OEF and you want to close, who are you going to sell them to? Even the shares are only showing average daily volume of about 1000. Not an issue for trading IMHO.
HTH.