Cost-benefit analysis is a weighing-scale approach to making business decisions: all the pluses (the benefits) are put on one side of the balance and all the minuses (the costs) are put on the other. Whichever weighs the heavier wins.
However, since the story constantly points out Jon's conflict with his illegitimacy and Ned's strict code of honor, many fans have come up with a theory that actually explains who they think Jon's parents really are. Fans know the theory as R+L=J.. R+L=J would refer to Jon Snow (J) being the child of Rhaegar Targaryen (R) and Ned Stark's sister, Lyanna Stark (L) rather than Jon being the illegitimate child of Ned.
Welsh actor Owen Teale, who plays Ser Alliser, looks like quite the friendly guy in real life. Ramsay Bolton, the despicable heir of House Bolton, was finally defeated by Jon Snow and killed by Sansa Stark. He's played by Welsh actor Iwan Rheon, who is certainly not as evil as his Game of Thrones character. Ramsay murdered his father Roose Bolton after the former had a true-born son with his wife, Walda.