Because a relationship between two middle-aged adults wouldn't do much for the ratings, but any scene with Seven -- especially a romantic one -- would.
I spent 5 years following Sally Filed manbagging a succession of silverfoxes on Brothers and Sisters.
Apparently "Dilf" is a thing.
But the Dilf they were talking about was obviously a GDIF.
Is there anyway ever that Lord of the Rings is not blatantly homoerotic?