What is this "financial model" you imagine?
Utilities will need storage, and will build whatever is cheapest. In some places that will be pumped hydro. End of story.
If you are wondering why a company need a financial viable model to operate on then I can't help you.
If you want to blame the lack of renewable generation capacity then feel free to do so. Pumped storage could in theory, in the future, when the time is right, be cost effective. We don't know. We are not there yet. Its a financial model to be to be tested when and if we get there.
For now the financial model for existing pumped storage do not care about the purchasing price or selling price, or what kind of power it is being charged with.