Most milked franchises 

[coolestguyever]

There's so many:

Mario, Need For Speed, Final Fantasy, Guitar Hero, Call of Duty, Ratchet & Clank, Zelda, Metroid, Mario Kart.


Then there's some getting very close to being "milked" such as: halo with all the spinoffs coming (Wars/ODST/Reach), Metal Gear Solid, Wii ___ (Sports/Play/Fit/Music), etc