Moving people from the benefits to a low-paid job doesn't really benefit them, so it doesn't happen - but that is as much a consequence of there being little social mobility in the UK as it is the benefit system being 'generous'. Whilst its of no real consequence to anyone in employment, there seems to be a queue of working-class blowhards with a chip on their should who have convinced themselves that if they're not slogging, they have no value - and in turn believe they have some right to look down on others.
The government seem to have convinced us of their vision that getting people off benefits is a success in itself when it is not, moving people into minimum-wage dead-end jobs is as much of a failure as allowing them to continue to live on benefits. Social mobility is needed, to merely work is not enough, people need progression for themselves and for society in general.