If we sell the Boeing March 17 $170 Calls for $5.00 and shares of Boeing close below $170 on March 17, we keep the Boeing January 2018 $135 Calls and pocket the $5 premium. If we divide the $5 into our $31 cost basis, we make 16 over the same time period and go out to April or May and sell more out-of-the-money calls and repeat this trade over and over again, hopefully all year long.