Film studios are a business like any other business.
Their goal is to invest their resources to make a positive return, ROI.
All the major film studios are publicly traded on the stock exchange, often as a division of a larger media conglomerate.
If that division DOES NOT make prudent investments it risks being sold off with it's licensing assets.
That isn't good, and something to be avoided.
Consumers are retarded. I mean "conflicted."
On the one hand they want new and innovative products, and on the other hand they want something that they are familiar with, and on yet a third hand they want to complain if your give them new products they don't understand while at the same time complain about you giving them the same old stuff.
Well... SH!T! F#CK! D@MN! MAKE UP YOUR G D MINDS!
If consumers like a new or existing product - give them more of that, only a "little different", with like caramel on top. And then again with sprinkles on top. BUT NOT CHOCOLATE CHIPS! That'll freak 'em out! Maybe if you blend the chocolate chips INSIDE the product they'll go for that.
It's a cr@p shoot.
Tent poles.
Tent poles, remakes, and sequels are profitable because the audience has already vetted the material.
And it's best to go whole hog with monster budgets. Or semi-monster budgets, a la JOHN CARTER and BATTLESHIT. SHIP! SHIP! BATTLE
SHIP!
Introducing a set of characters in a "universe" is an expensive gamble, one studios are loathe to do but smaller production outfits are only left with this high risk option.
So, if you're a major studio with $500m to spend over the next four quarters where do you spread your risk?
Across one or two big budget films, eight fair budget films, four low budget films and buy the rights to fifty intellectual properties to shelve until the rights convert back.
If you're a minor studio with $15m to spend over the next four quarters where do you spread your risk?
One fair budget film, one low budget film, and five intellectual properties to sell to someone else like trading cards.
That's why.