There are other things not just business, they could invest in crypto, stock, or forex trading.
There are also who invest in asset's or real estate, if they could save enough money they could do it, the problem with some people is that they are already contented by their life style living with enough money to survive till their next salary comes, enough to pay bills, put food on the table and have a good time, shopping spree.
This is a condition where someone feels they have enough, but if not, of course they will continue to work harder and this is not about our lifestyle, but the cycle that is maintained so that all needs can be covered properly without having debts or asking for loans from other people in the middle of the month or towards the end of the month before the monthly salary arrives.