Ahhh yes, the benefit scams. I too know a few that used to do this in the UK & still do. Often claiming to be mentally ill & claiming disability premium (if that's what it's called now) + housing benefit & still able to hobble around from door to door, God-bothering.
It is wrong in my opinion. If you can work in the field and attend regular meetings + participate, then surely you can at the very least work part time and contribute to the society you are leaching off ?
I know there are genuine cases, always, but few in the active ranks of "the truth".
Of course there is always the option of shopping a JW to the local authorities who is falsely claiming benefit while "working". You would probably be doing them a favour, a lesson in taking full responsibility for their own life, something that being a JW robs them of.