Usually it was very rare that such large amount of money was changing hands.
“Burkhart, do you have some wish for yourself? Margraviate Breithilde shall receive a different reward.” (Helmut)
Burkhart-san was Margraviate Breithilde’s retainer. For this time’s campaign it took the form of His Majesty ordering Margraviate Breithilde.
Therefore, no matter how much His Majesty wanted to appoint a peerage rank to him, it was no good due to that reason.