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Honestly, I do not see a reason to charge extra for an installation of GrapheneOS since GrapheneOS costs nothing for the person installing it. Additionally, the installation is very simple using the web installer even for a non-technical person. However, I do not know what extra costs you might have to pay (like shipping) so maybe the 100$ extra would be justified.
I know Nitrokey offer their Nitrophones which are pixel devices with GrapheneOS pre-installed and charge a premium (715 Euros for Pixel 7a) which I think is definitely unjustified. As far as I can tell from their website, this is what they offer extra:
"In addition, we bear the risk of technical defects during production and still sell the NitroPhone with standard warranty. In addition, we offer technical customer support. Optionally, we remove microphones, sensors and cameras from the NitroPhone."
The only time I think charging extra for GrapheneOS pre-loaded phones would be okay is if it is a bulk order for a company that wants to use secure phones and do not have the time to flash GrapheneOS on a large number of devices. Other than that, I believe individuals should just flash it themselves.
These are my two cents on the matter.