Final answer:
The servants feed Rukmani and Nathan lavishly because they admire the couple for their kindness and resilience.
Step-by-step explanation:
The servants at the doctor's house feed Rukmani and Nathan so lavishly because they admire the couple. The text states that the servants 'adore' Rukmani and Nathan, suggesting that they have a deep respect and admiration for them. This admiration likely stems from Rukmani and Nathan's kindness and generosity towards others, as well as their strength and resilience in the face of adversity.