As Burkhart-san himself appears at this point, it looks like he has no particular regret over the large money reward.
Although I have a feeling as if he didn’t attend His Majesty’s audience due to a bad physical condition before that, anyone could obviously see nothing but his healthy body.
“Please sympathize with me there, boy.” (Burkhart)
In the first place Burkhart-san isn’t an official member of our party either for coming along to such an important place.
Since Armstrong-doushi went with us as guardian instead, he spontaneously faked poor physical health.