I use to watch The New Adventures of Chor Lau Heung with Miu and Barb many times when I was a kid because I loved it so much. Watching too much can get bored. I mean I still like the series now, but I don't watch it as much.
I think the only series that I watch at least once a year is The Grand Canal, my all-time favorite series. The other one that I also like, but have only watched once is The New Heaven Sword and Dragon Sabre. I don't own the 1986 version so I've only watched it once online. Also, it's hard to watch series online, so I don't watch it more than once.