The fact the anyone or anybody can buy it either in large amounts or just a portion, tells that bitcoin can be for everyone. Its just the outcome may differ as you already stated the possibilities when buying in large amounts. But if you see it as an asset that you can use or as a stepping stone to get on a better position or to get rich, it can be for everyone since you will have a chance to do what you want on that asset, either hold it for a long term or sell it. Or you can explore how bitcoin and crypto works and utilize all the possibilities. Since you already have the knowledge about bitcoin either you can buy it large portion or just a fraction is an advantage that everyone can be proud of.