Some people really take wants as needs and for granted when it may just be something to make them feel good.
The haircut example I find is a need for me, because I get sweaty easier with more hair as it isn't thin, this can lead to lack of sleep due to being uncomfortable, leading to the possibility of making a mistake or something else going wrong in the chain of events.
But there have been other times for things I thought of as a need (while I was much younger) but they were wants. So it is good to know which is the thing you are thinking about.
That's true @thegoliath, despite the classification that society gives to different needs and wants, individuals will find that what one person deems a want will actually be a need, and vice versa. I can see where you're coming from in the case of needing regular haircuts - especially if there is increased chance for error.
Thanks for your comment.