Series/Franchise milking the most out of people?

At least they're whole new games. FF: Crisis Core, Before Crisis: Final Fantasy and FF: Dirge of Cerberus were spin-offs, yes, but unique after all.

Well, not counting the movies.

Still milking.

But yeah, I was aiming specifically at the ports and re-releases. Content doesn't matter, releasing the same game every two years is a scumbag move.