An interesting article on the World Economic Forum website talks about the benefits of exploring Mars:
There are also reasons for visiting Mars that transcend the purely scientific. Sending humans to Mars is a challenge that will spark innovation and the development of new technologies and capabilities. It has been estimated that every dollar spent at NASA adds about four dollars to the American economy. As President John F. Kennedy once said, we don’t do things like putting a man on the moon “because they are easy, but because they are hard, because that goal will serve to organize and measure the best of our energies and skills.”
These efforts have real benefits for life on Earth. Indeed, many of the recent technologies developed for space already have practical applications on Earth. The water purification system used on the ISS is currently helping to provide clean water in remote regions. Work on NASA’s new Space Launch System and Orion capsule has led to faster ways to charge batteries, and to the development of advanced manufacturing techniques and lighter aircraft structures.
However they don't specifically mention the practical benefits of a potential discovery of life outside our planet. Assuming we can find some simple form of life on Mars or Titan, how would the median human back on Earth stand to benefit, at least in the long-term? I do understand the positive impact of developing new technology to search for life but those benefits would be present regardless of whether or not we end up finding anything.
In other words, between two universes where in one humanity finds a simple form of life on Mars and one where it doesn't find it, how would the humans in the first universe be better off 50 years after said discovery?