I've been in diminished circumstances in the past and around people who live this lifestyle. You would be amazed at the number of people who really have simply dropped out. These are older people, too. Life really is just waiting for your monthly cheque, after paying off the basic necessities just blowing what's left on booze or whatever. 

Why not? It's not enough to make any real difference, it gets you through the next few days or week and gives you something to look forward to for next month. The rest of the month is just getting up, going out for smokes, dropping by the fook banks and free meals, hanging out with friends. Life is narrowed down to nothing more. And that's all they look forward to for the rest of their lives, which could still be two or three decades away. 

UBI will pull more people into this. It's sad. People didn't have to have degrees and education and training just to live a normal life. There was a place for everybody.