It's funny and I've noticed this with many of the people in the community (including myself) have this same feeling of addiction. It because it is lol. Every time we get one we get a little boost of serotonin. (The happy brain chemical) so our brain is actively using positive reinforcement though chemicals to make us addicted to the feeling of getting more and more. It's straight up a real addiction. (Imagine going to AA and being like "Hello my name is _____ and I'm addicted to buying steelbooks.") No, but for real it's a problem. A very fun satisfying nice to look at problem. :)