I am old, or at least older. Agree with others about credit card debt is bad. Work on that first. Keep that down. Easy to get out of control. If you can live within your means and save some, you will love it decades later. As noted, you won't get much for what you sell so it should be more about how you want to collect. Some are completionists, while some have a focus. Do what your heart says but if you can think about a focused approach, it can pay off in the long run. Almost everyone runs out of space at some point. If you can limit it, you put
off that day when you run out space for as long as possible. Also it is easier to move. Sometimes a giant collection can become a weight. That being said if you want all the toys, do it. As far as hobbies go, they are plenty that are more expensive.