Adjust your "strategy" now.
IMO, intraday margin is on it's last legs. Exchange margins are only going one-way. 3 substantive increases so far in Q4-08 (1-month)! And with the government calling for OTC clearing, and the CME vying for billions worth of clearing fees, rest assured the CME will do what the establishment wants... raising margins is the tip of the changes for the futures industry and us/U.S. traders. The game is in flux, amid the un-official transition.
I'll even go so far as to say that within 2 years OX (parent of OEC) will be purchased and/or merged with one of the new financial-grid players. Default on a credit card and your futures or options account can/will be raided. Start reading the fine print of all things financial; It's happening already.
Good trading to all.
Osorico