Good point you just made, I am only looking at the scenario where I'm looking for a 10% move up or down, in the case of NTES and CRM, I'm looking for 10% move up. My research is soley based on that issue. Hence, these are earning trades and nothing more.
I should point out, trading earning trades here blindly, a trader only has a 33% chance of picking the correct direction with a risk ratio of 1:1, because there's a 33% chance of an up move, down move, and no move at all on the stock. Choosing up, the trade would lose if if the stock didn't move or if the stock moved down.
I started with that reality in mind. Then, I used some basic technical/fundamental/contrarian research to increased my odds from 33% to about 66% winning trades with a risk ratio of 2:1.
From the Quarter from Jan-Mar. 2008, I made 26 earning trades, 17 winners and 9 losers making 65% of my trades winners. My risk ratio (avg. winner/avg. loser) was 2.29:1. For ever dollar lost I made $2.29 back. And again, only for this scenario.
Had I bought long term positions buying options that are further out in expiration, debit spreads might do the trick for a directional play. In fact, for more experienced traders, I would wait and leg into the bull call spread.....taking the short side as the stock rallies higher.
And eventhough I hit on average 65% winners with a 1.80-2.50:1 risk ratio, in now way am I going to over leverage myself and take on more options than I need to, especially when the IVs are this higher already. It takes great money management along with a strategy to win. On average, I'll risk no more than 10%, 15% if my research shows that I have a greater probability of being correct, and 5-6% if research gives me a 60% odd of being correct. If my research gives me no direction on the move, then I'll skip it.
Remember, I'm playing earning trades on a 1-2 day time frame with expected 10-15% move on the underlying stock. What I'm doing here is that I'm expecting my research to help me overcome IV crushes, and that's how I came out with IV=50 and stock makes 10% move, options will hit 100% everytime. IV=75 and stock makes 10% move, options will only gain 75% on average. IV=25-30 (low vol stocks like MSFT, GE, PFE, IBM too) and stock makes 5% move, options will gain 100%, on 10% move options will make 200%. And I'm not using any formulas here, just from experience with earnings trades 2-5 times a week 50 weeks a year.
Play this game long enough, and you'll see moves like PCLN and FLR (after earnings report) before the move occurs. Options are risky, and gains aren't guaranteed, but if your odds are 99%, play it. Just use sound money management in case that 1% hits you.
Good luck and we'll test how NTES turns out tomorrow morning. I didn't mention what would happen if the stock turns lower, but I'm sure we both know the results for both strategies.