There's without a doubt blaggers (I know of someone who was spotted having a rare time playing football with kids when they'd claimed this was impossible
).
I think it's OK to point out that there are folk taking the piss at the same time as being aware that there's folk who absolutely depend on it though. I think it's quite hard for some folk to accept sometimes that some people would rip the arse out of it if you aren't that way inclined yourself or haven't seen it.
The blaggers have absolutely fucked it for people who rely on the benefit. I've got loads of examples of using 'on a bad day' (who were absolutely deserving of the benefits) that didn't get through assessment, but I pushed it and it sailed through tribunal and it still amazes me that folk are able to fake it now, but clearly they do.