Creative Definition link
Lucrum - latin root, means gained
Lucratif - Middle English term, evolved from latin root
ive - suffix, adjective form of a noun
Lucre - related word from same root, means money
Something lucrative describes something one can profit from.
“In the early days of your business, a new type of project — especially a lucrative one — is incredibly exciting” - Harvard Business Review
“Here she explains how to start a potentially lucrative career by working from home as an affiliate marketer” - Entrepreneur.com
“Several comic book writers and artists have announced lucrative deals to provide exclusive content for the California-based company founded four years ago, in some cases eschewing contracts with Marvel and DC to do so” - The Guardian
It likely has a history of being used to describe economic transactions in Rome and then continued to be used amongst people doing business in Europe.