Multiple factors were at play.
Yes cost was one and probably a significant one. But it was far from the only one. Guests serveys and comments have been strongly been calling for another family friendly coasters that young kids can ride as they transition from Grover to big kid rides. This will be BGW's first 42 inch coaster and that really help fill that void. I would have loved to see an RMC or other big ride go there but from a business perspective this is the better call for BGW and fills the wishes of their customers. I personally wish they had chosen a different location and saved this for an RCM or a gigantic but that call is what it is and at least we are getting a tribute to the parks history out of it.