I hope this passes because it will put to the test some of the possible benefits of a basic income. This is an interesting question:

   "One of the main questions about something like this 
    is about who would do boring, low-paid work with 
    this sort of basic income. What I would really hope 
    is that people would still do many of those jobs, 
    but for far fewer hours--largely as a way to get 
    money for incidental expenses and luxuries beyond 
    the basic income. One problem I find with most jobs 
    is that it's much easier to get more pay than less
    hours, even if I really want the latter. There is a
    large drop-off between full-time and part-time work."

As I understand the theory, people will do this for exactly the reason you give, which is that it will add to their income for extras. The basic tenet of the BI concept (as I understand it) is that you provide subsistence wages and do not add an economic penalty for working, thus people will work because it won't cut down on their basic income (like it does with welfare) instead it will improve their income picture.