It's not deterring as many people as you would think, though, as Dutch company Mars One, the company recruiting for the one-way space flight, has received more than 10,000 emails from interested parties. The flight would leave in 2022 and reach Mars in 2023, where you would live out the remainder of your years, as the technology for a return flight doesn't exactly exist yet.
The purpose of the mission is to build a colony, which is as noble as purposes get. The group is looking to launch a supply mission as early as October 2016, then a rover mission in 2018. The budget for the colony is $6 billion, over double the $2.5 billion budget for the NASA rover Curiosity.