Though $1000 is a money typical let's say IT employee can easily spend and lose without having major issues. The issue with some early BTC adopters is that it was like buying a lottery ticket, most probably assumed that they would be likely losing the money, therefore they didn't invest in security and careful planning. Many people working for FAANG for example don't have to work that long to make $1000, so it is quite natural not to spend several hours of r&d on $1000 investment.