This is SUCH good advice. In college and for a few years out of college I was terrible about doing this. I had easily 30+ domains I carried for a few years (some I renewed, some I replaced with other "ideas"). After thinking about it a lot I realised that spending money makes me feel like I've accomplished something without having to really do any "work". I had to break the same habit when it came to buying things in general, I used "retail therapy" to make myself feel better and feel like I was solving a problem. Oftentimes buying that thing was not necessary for the change I really wanted to make but it made me feel like I was making an effort when really I was just throwing away money.
Domain names are the same way, I would purchase a domain for a project I dreamed up in my head thinking that buying the domain would motivate me to work on the project (wouldn't want to throw away that money after all right? right?). All it did was give me the endorphin rush I desired and then let me go back to doing whatever I was doing (which was not working on said project).
