We are stuck with our minds as long as we live. It is the thing that we are sure to spend the most amount of time with. We may loose a limb or two in a tragedy. But Our mind remains our own. This is why I consider spiritual development to be the most important part of my life.
Additionally, what if there is an afterlife? You are surely not going to be able to take anything from this world. You won't even have your body no matter how well you maintain it.
Our minds are also the very root of all our actions/karma. With the exception if some biological reactions like knee-jerks, we have to think to act. With a good wise and insightful mind comes good decisions and only with thinking smart we can build a better world.
But not everyone thinks like this. So I'd lik to know your opinion.