>>280031716Wrong. They did get-rich-quick schemes several times. Most of the times it's Nobita's idea but Doraemon is also blinded by money. There is this chapter where they sold concentrated energy as a warmth and light source. Doraemon raised the price ten times by the end (much to Nobita's horror), but then their machines exploded and the light leaked into the atmosphere.
https://doraemon.fandom.com/wiki/Dry_Light