The big boys generally SELL the options - although retail investors like me do as well.
Selling an option can be a much safer way to make money as it can be made far less risky, particularly if you sell options on indexes rather than shares.
For example you can set up a credit spread on any US index and calculate the likelihood of the trade winning.
The credit spread is either or both the highest and/or lowest point you think the index will get too over the period of the trade (each credit spread is a different trade). Providing the market does not hit either line you win twice.
Think of it like this, the FTSE as I write is currently at 6426, if I think the FTSE will bounce around over the next few weeks at no lower than 6300 and no higher than 6600 I place two bets - one that FTSE will not go above 6600 and one that it will not go below 6300 - and providing the index stays in that corridor over the few weeks I win twice.
The bigger the gap the more chance I have of winning and you can mathematically predict the chance of it staying in that corridor. If you set the gap to big nobody will take you up though.
The extra beauty of this is most trading platforms allow you to use the SAME capital to place both trades, as in reality it can only hit one of the lines, although mathematically possible. If it did happen though you would owe the money for the second trade.
You can get around 70% (seventy) annual return on your at risk capital by doing this.
As you make money when you SELL the option, as long as the lines are not hit or crossed, your profit is the premium you originally charged for selling the option.
The software sets the premium which is driven by the market and what other traders are prepared to pay to tie you in if something happens.
Think of it like insurance, someone is paying you a premium to take the risk in case something else happens.
You become the bookie rather than the punter - and we all know who wins in the end
PS if you want to know how to calculate everything, PM me and I will put you in touch with the people who educated me. The detail of it working is highly confidential and covered by IP which I will not break.