Because she adds much-needed levity to dark storylines about alcoholism, arrests, heartbreak, betrayal, and feuding. She's pure New York delusion and I adore her. Also, she literally froze her dead dog, ended Dorinda (not even Bethenny could do that), nearly killed the cast in a boat, wept in clown makeup, and gave Luann a hard time about her marriage. Respect her! Honestly, I'll defend anyone from Season 10 of RHONY, because they were all absolutely perfectly placed, the greatest cast bar none. The dynamic is so strong that fitting in is incredibly tough. Just ask Cindy, Jules, Barbara, Leah, Elyse, and Eboni. They all arguably failed to get in there with the rest, for many different reasons. Tinsley managed to fit in while the rest just didn't or couldn't. How she managed it, I don't know, but she did. Possibly because of her existing relationship with Sonja, perhaps.