Sure, I'll play devils advocate.
Perhaps he though A job with some income is better than no job with no income, no work friends and feeling apart from society.
We had a lovely chap who was learning disabled who worked in a restaurant,everyone did everything on a rota, tills, cooking, stock, chemicals,cleaning,etc but his job was wiping the tables and collecting the trays and he loved it, he was super friendly and chatty and was invited to all staff nights out, birthdays celebrations etc but as soon as the contract was re tendered and satan did time and motions studies he was deemed economically efficient and binned after 18 years! He was gutted and offered to work for free because it gave him,independence and structure and friends and all the things many take for granted.
Im sure he would have like the opportunity. As long as the money earned did not reduced other entitlements/benefits this could have been good. Particulary for sole traders and the likes.