"For a truer picture..."

Woodsy42  left a comment on "Huge families on benefits are no myth... oh, hang...":

"There are 160 families on out-of-work benefits with ten or more children."

I find this very difficult to believe. It's less than one per town. For a truer picture, how about looking at the number of large families that require benefits because, even if someone works, they could not have afforded those children without benefits?

I've linked to my data sources, if anybody wants to have a crack at the numbers, feel free to do so.

But the cost-benefit calculations are all very marginal and there are so many judgment calls to be made that you could come up with pretty much any answer you want, you could come up with a reasonably plausible answer anywhere between "a third of all children" and "hardly any".

And this cuts both ways, I could just as well ask:

For a truer picture, how about looking at the number of retired people (especially early retirees) claiming taxpayer funded pensions (state or public sector) who would still be working and contributing if those pensions weren't on offer?

or...

For a truer picture, how about looking at the number of buy-to-let landlords collecting national wealth privately who would still be working and contributing if we taxed land rents instead of taxing earned incomes?