That's actually the hard truth. Some altcoin could just gone into oblivion within span of few months and imagine owning that alt, money gone become dust without knowing. BUT, it's the same as anywhere else. You go buy company stock it could go down very hard just becaue the company makes some mistake. Investment is not as easy as people might think. You see people in youtube, tv they always telling us to invest to generate easy money but honestly they are just some BS and yeah half bread better than none. Usually when people gets greedy want to take as much profit as they can they instead losing.