Option writer VS Option Buyer = One always gains 90% time Other always looses- A Case Study

I have always heard that It's option writer,who always wins in market and particularly on day of Expiry and genuinely ,if he chooses a sensible range of ATM(In the money call option)& ATM may be some other Smart Buyer as well( at the money call option),90% of time I have won myself and i have seen people winning with this strategy.

             Of late, on 21st May only i have captured a data, where i have seen Nifty was hovering around 9104 at 9:29 AM.

And at the same time we have following figures to be watch for also.

1) 9100 call was at premium of 33.55

2) 9000 call was at premium of 107

3)9100 put was at premium of 34.10 

4) 9200 put was at premium of 105.90

Now carefully think what would have happened to BUYERS of these call and put option on day of expiry that is on 21st of may.

There may be few of other smart option Buyers as well ,who might have bought call and put of same strike price with almost equal premium.

In above case both 9100 cal option and 9100 put option at premium of (33.75+34.10)=67.75 and few more smart Guys ,who might have taken 

9000 call and 9200 put at premium of (107+105.90)=212.90 thinking that they are buying in –the money option .

Now interesting part is this that i will share rate of 15 :28 of the same options and we will come to know that in any of the strike price who has made the money and this is not the single story of this particular expiry.

Nifty 21st may call option 9000 CE  106.00  no change in premium

Nifty 21st may call option 9100 CE 6.00    profit of 28 points to Option seller

Nifty 21at may put option 9100 PE 0.05 profit of 33 points

Nifty 21st may put option 9200 PE 93.86 profit of 12 points

Idea here is to sell correct strike price  options(either call or put), you have 90% possibility of making money and with the same data yo can easily understand what would be the position of buyers.

Please do write me your comments in box , your feedback and choices of new article will encourage me to write different strategies of cash and option trading.