That degree would destroy the empire...
All men over the age of 18 would leave the empire without black smiths, lacking hands for harvest and other necessary areas for the society to work. That is without saying how many of those men would be so old they would not be able to fight anyway...
"no abilites that could make money"... did she forgot that she comes from a ultra developed time period and the little knowledge she has is enough to make things that don't exist and make money with that?
Heck how many of these kind of stories have the MC making money out of simple recipes or games they knew about from their previous lifes? She doesn't even need to make the damn thing just show the idea and request that someone else make it, she is a noble after all. (I realize that I'm expecting a level of intelligence too high for the tipical reincarnated trope MC)
Teaching him that there things more important than money is useless becuase the reason the events of the novel happened is not because he didn't knew those things but because the necessity forced him on that path.
... What can be said, you reap what you sow.