It is unreasonable but it is effective and for how long it has been in our civilization, I think that we will have a hard time uprooting this system because it's coupled already with the global economy and global supply chain and what happens when we take away a keystone to those things, it will eventually collapse, it's a parasite that we can't remove.
Not exactly effective. Most of our world chases money, and neglects more important factors. I like the saying that we work to live, and not live to work. However, the reality is most people live to get money, and then they don't even enjoy it when they get it, because by the time they've amounted any sort of substantial earnings, they are on their death bed.
The system is designed to keep the poor, well poor, and contributing to the wealthy companies that pretty much rule the world. So, no the current money system makes no sense, yet people contribute to its survival every day.