I bot one s&p call of 100 multiplier at yesterday's low and sold today at a loss even the market rallied handsomely. I guess it is because the vix. so be very careful if you buy option when the vix is high. you will suffer a loss even the market moves as you expected but the vix falls. I found the S&P option of 100 multiplier often cheaper than the 50 multiplier's. sometimes the spread reached one point, strange...