Some people decide to hold it until they meet the price they want. Some may lose their private keys. Or maybe some of them cannot find the private keys anymore. Imagine where satoshi is now. He also has a lot of Bitcoin that did not moved for a long time now.
Those Satoshi’s bitcoin doesn’t seems like something that he lost, he might have actually just created a new wallet and throw those bitcoins there and then throw the keys away just to maybe add value to the circulating ones as he as he did say himself what lost coins are for. Or probably he is dead and no one knows the whereabout of the keys. Those could be the cases but for him to have mistakenly lost them I don’t think someone (if he is human) like him is too knowledgeable for that
Someone has to prove that it's transactional, and we can buy things with this. Just imagine we are all buying Bitcoin, and no one is spending, and it has no use in reality. So, what is the point of gathering more and more Bitcoin and no plan to spend it? Some people see Lazslo as an Idiot because he sold 10000 Bitcoin for two large-size pizzas.
If we look at the Lazslo cases it is because many people are just seeing it now as him been wasteful because of how expensive bitcoin is now, I bet before the mining of bitcoin even ends some of the next generation might even finds us stupid too for how we spent ours too.
Another reason for why bitcoins on some addresses are still yet to be moved could be maybe some people actually deliberately Time locked it or mistakenly set time that is far too long.
"Why you create a post after two months and two weeks of your registration date?" obviously you have a reason, while I can only guessing about your reason.
He could have reasons, maybe wasn’t ready to embark on this forum journey yet, or was still looking into one or two in the forum. But his first post isn’t actually bad as we normally have from newbies