This is a massive question in my opinion with many questions of ethics and morals to be pondered. Whilst you can say that money is simply an inanimate (on occasion intangible) object of which more can always come, and that life is precious and only comes once; you can also say the exact same - another way. Yes, more money can come and yes, life will end - unpredictably at that. So perhaps the most predictable is the logical choice? Money.
I guess without all the pseudo-psychology, ethics and morals bother in the way the real answer is a question - More important than which life?
Not to avoid the question though, my answer is no. Whilst it may be pertinent to end a person's life, it should be their actions that give us that just, not our possible gain.