There's a cost not just in time, but also in willpower. There is some disagreement as to whether willpower is a finite resource or not, but if there is even a partial limitation, then coming up with that willpower needs to be taken into consideration.

Also, saying "you make time" is true in such a way that is of little value, as there are a multitude of things you can make time for, such as connecting with your friends and family, learning new skills, educating your children, and any of those can take up as much time as you have. Life is a balance of things where you try to minimize your regret, since there is just not enough time to do everything you want to do.