At the same cost SpaceX pays for a launch? That seems improbable to me.
But if it means they can increase the # of rockets they build, they might pick up some efficiency gains on the back stretch. I'm pretty sure they're already struggling to keep up with demand, tho.
I believe they have eight block 5 Falcon 9s that landed successfully. More if you count previous generations, but those likely won't be reused.
Until somebody else challenges their price, they can get huge profit from every launch.
And before we jump into this rabbit hole, yes, they can totally fund their own payment system with $4K and a small yellow pages startup. :o)