Based on people I know, either (1) they enjoy it and don't have anything else they'd rather do. This is common among business owners. Or (2) they also spend a l

Based on people I know, either (1) they enjoy it and don't have anything else they'd rather do. This is common among business owners. Or (2) they also spend a lot of money and no other job is going to pay them remotely close to what they need to earn to continue spending the way they do. This is more common in industries like law and finance.