Using gamblers as an example who start out with just the intention to have fun maybe and then along the line turn into addicted gamblers that gambling begin to affect other areas of their life like their wellbeing like they stop spending on some important things just so they can make money available for gambling. Now talking about investing, I think it is possible to become addicted to investing so much that it begins to affect your wellbeing, like the person stops spending on other important things like good food, good clothes etc. just so they can have more money to invest? Do you consider that kind of addiction dangerous and not good?
This is definitely true and can be applied to many activities in life. Everything is ok in moderation but when you start becoming obsessed with it or taking it to extremes, like being overly frugal, it is a bad sign. Not only that but life is for living - while money can bring you comfort and freedom, what does it really matter if you are old and too frail to have fun with your vast accumulated wealth as you pinched the pennies throughout your whole life. You need to find a fair balance and can do this with strategy, you might set a certain amount of your salary to "fun money" for example and you should avoid spending that on investing activities. Recognizing you have a problem is half the battle, especially when you're doing something that many people would see is productive and good for wealth accumulation.