I think a lot of traders a coming to the conclusion that DT stocks is not worth it anymore due to the decreased ranges. I am sure that is one of the reason people are migrating to the mini contracts. Has to do with the VIG. Read Neidehoffers discussion about it in his edu of specualtor book. Chaper 8 . Just compare the cost of 1 emini at $5 RT vs. SPY 800 shares @ penny per. Emini comm/min tick = 40% of min tick 800 SPY 200 % of min tick. o 1 contract. If you are using this as the ONLY criteria then you'd have to gravitate to the minis. Of course there are OO's ,sector plays u can't do with the minis' To each his own I guess.