Yes, beginners are most prone to fall into this trap. But also long-timers have registered new domains that they later regretted and dropped. It is part of the game. Don't allow emotion to get attached to whether you only hand reg or only buy aftermarket or expired auction.
Investing requires thought and the confidence of return. Whether that is before the first year renewal or years into the life of the domain.
I think we all sometimes fall in love with a name or two and get them before thinking too much. It's almost like sugar foods. You eat some, well, then you might eat more than you should.
The center of reward, triggered by money and drugs is also triggered by a nice sale. You get the rush. Years later I still get the rush. Fortunately, I control it, something I fortunately learned in my young years - controlling addictions of all kinds.
But indeed, domaining is about profit for most of us. And in this case, emotions have no real place to be in. And if you ever carried out, well, admit that quick to yourself and divert course.
Many domainers are hoarders. I guess I'm a bit of hoarder too, but a controlled one (tip: don't stretch it too much). It's that feeling and hope that you're gathering value; which is always partial. I mean, some will never sell and some will sell fast and you can't always tell which is which and how it ends. But you have to watch the numbers and make sure you're aiming for the profit.
Be an investor, not a collector. And focus on selling and making $, not on just having.
I'm often watching documentaries I like, about gold diggers around the world. I find this VERY similar to domaining. You do the legwork, find treasures that others might not find or recognize quick, then you make money off of that. Sometimes you find the big gold nugget - well, those guys get the rush, I guess any of us will feel excitement when managing to grab something truly valuable.
So in all aspects, I think emotion is here to stay. Who really can cancel their emotions? Not even psychopats - they have and recognize emotions, they just don't react normally to them.
The idea is having emotions but being able to control them. Depending on how young you are, one might find more or less difficult to do so. Better control comes with age. Young people are more prone to getting carried by emotions, so I always point them the wrong things but give them some slack cause we all are like that when very young. Which I'm not anymore, obviously.