Upgrading would have cost way more. one of the reasons atom power is so expensive (without government subsidies) is the cost of the plants which needs to be recouped as well as the price of the uranium. not to mention that we haven't found a suitable place to store the waste for those thousands of years until it's harmless.
i hate that phrasing to describe sex work. no one is "selling their body", as they are still in control of it. sex workers provide a service, same as a masseuse or hair stylist (except their service involves genitals) and it should be treated as such.
Otherwise one could argue that all (physical) labour is "selling your body"