They suck us in when we're babies. Toddlers, even. They nab us while we watch at our moms' and grandmas' feet. At least, that's how it was for me. By now, I've watched for so long that I literally can't imagine my life without it. Investing all of that time adds layers and depth to the current stories. An outsider can't see it, but it's there. So, for example, when the camera zoomed in on Mac's face when he saw the body of his murdered daughter, a piece of my heart broke for him not just because it was sad, but because I remembered the look on his face when Felicia told him she was pregnant, when she told him he wasn't the dad, when she was born under a table in a jazz club, when Mac held Georgie for the first time, etc. Granted, some writers and some actors do it better than others, but that history is always there. 🙂
Also, soaps are on every day five days a week all year long without any breaks. They don't give you time to forget or lose interest. And they keep you waiting for that next fix. It's like a drug! Soap addictions make weekends seem waaay too long. soap fans spend as much time per week watching one soap as they do eating dinner. Two soaps? Lunch and dinner. Three soaps? You spend as much time watching soaps as you do eating. It just becomes a necessary and automatic part of the routine. That's how they get viewers. Once they snag you, they become essential to your being. lol.
Edit:
OMG! I'm sorry about the spoiler! It happened right after New Year's. Kristina Wagner is back for this story and everything. She's working with the police and Mac to solve the case. Maxie is also unbelievably hostile toward her. lol. And Dillon came back briefly, too. I'm so sorry to spoil it for you, but yeah. You really need to see this.
Go take a look at the clips, man. John J. York and Kirsten Storms really turned out some high quality work on this story.