Some people genuinely don't care about smells and such, and construction and maintenance is satisfying without being pushed to always do more with less... People do it for free all the time. Just this week, I helped my neighbor with some stuff, I like using tools and using my hands.

People literally pay to pick berries as a fun group activity. People go on wait lists for things like habitat for humanity

People like doing these activities. They don't like the conditions of a job doing these things.

Clearly, there's some middle ground - you don't need the threat of homelessness to get people to work. You can make less desirable jobs well paid, let people play with the fancy power tools, or have the jobs come with social status/privileges

Obviously it's not as simple as "hope someone volunteers" but it's clearly not some impossible to solve problem