I'm just an engineer, so I doubt I can really contribute, but a manager I've worked with once told me: The price of anything is as much as you can have the cus

I'm just an engineer, so I doubt I can really contribute, but a manager I've worked with once told me: The price of anything is as much as you can have the customer pay you. Meaning, in your case, as much as you think you can charge without having they quit the deal.