The price money was donated by the swedish central bank, I do not think they need to cash-in on anything
This makes me wonder: - would there be less backlash against the econ prize had it been funded by another government agency with "bank" in its name? - would there be less backlash if econ was like math, with no Nobel prize but a "top prize for the discipline" instead (the John Bates medal for econ, the Fields medal for math)?