Why are we wasting time on Mars, knowing there probably was no life there, when we could be more focused on...?

Saturn's moon, Titan, which actually has the materials to support life, although it's probably too cold, but it's still more mysterious than Mars. Mars has a thin atmosphere and has most likely never had life. I want to explore planets that do have, have had or could have life - instead of wasting time and money. Yeah, Mars is close and interesting...but it's not like we're gonna be here forever. Can't we put a priority on more mysterious and accessible worlds? I say accessible because we don't exactly have the technology to travel to other solar systems with humans in spaceships.