At least with Aliens you've had 3 great movies, a s**tty sequel, a couple of s**tty crossovers and a half decent quasi-prequel.
For Predator's fans we've had one really great movie, a decent 1st sequel, the same s**tty crossovers and an ok-ish 2nd sequel......oh i nearly forgot a fantastic sequel novel (Concrete Jungle) and an outline for a sequel that could've been a good to possibly great film (Predator's in a blizzard hit New York hunting Dutch).
But it seems Fox is only interested in milking the cash cow for every last drop. When RR was given the go ahead to make Predators he was given around half the number of days for filming and effects that the original film got.... and Fox demanded a big profit!!!