This is important for a variety of reasons not least that it would still allow all those who are vulnerable or out of work to continue to receive the help that they need. I would however show that there is no free lunch, that doing nothing is not acceptable, especially in times of economic hardship. It would give taxpayers better value for the money they contribute as benefits would effectively be subsidizing a large number of volunteers. If the minimum amount of work was set at 10 hours per week, with around 1.6 million people claiming jobseekers allowance alone that would be over 16 million man hours of work done every week. This amount of extra labour would allow a lot to be done.
The other major benefit could be that having to work for the benefits would hopefully encourage people who are capable of working back into work as they would no longer be able to get away with doing nothing. If they are having to pick up litter for the council they may think that getting a off benefits and into a proper job would provide more money for not much more work, giving a real incentive to work.