the practitioner benefits emotionally, not just financially (antisepsis: doctors as scientists)
I would guess that you feel emotionally better if less if your patients die.
A study conducted in 2007[27] sought to determine why people believe they share emotional episodes. According to self reports by participants, there are several main reasons why people initiate social sharing behaviors (in no particular order):
Rehearse—to remember or re-experience the event
Vent—to express or alleviate pent-up emotions, to attempt catharsis
Obtain help, support, and comfort—to receive consolation and sympathy
Legitimization—to validate one’s emotions of the event and have them approved
Clarification and meaning—to clarify certain aspects ...
http://www.newyorker.com/reporting/2013/07/29/130729fa_fact_gawande?currentPage=all
Seems related to many topics discussed on LW, such as the low adoption of cryonics and the difficulty of getting researchers convinced of AI risk.