Examples? Certainly. Let's look at the most vocally Christian business I know of: Chick-fil-a.
Three of the five standard positions at a Chick-fil-a store
pay roughly $15k annually for full time. The
federal poverty line for a family of 3 is $19k, and a family of 4 is $23k. Let's be really generous and assume that each of the ~1600 locations only has one of each type of worker, so 4800 workers are making about $15k.
Now, it's important to note that as the terms of its business, the Chick-fil-a company takes
15% of gross sales, and then 50% of pretax net profit from each store.
Now, if we go by the standard family of 4 poverty line, that would mean Chick-fil-a would have to donate About $38.4 million per year to have
it's own workers all be out of poverty. If you use the 3 member poverty line, that's still $19.2 million they would need to break even.
I can't seem to find an exact number for donations, but they speak proudly of the $1.6 million they gave to workers for scholarships, and there's considerable news about the $2 million they gave to a group of anti-gay protestors. But let's be generous. Let's round to an even $4 million. Then triple it to $12 million in annual donations. That's
still only ~65% of what they'd need to have all workers breach the 3 member poverty line.
Now, keep in mind this company
broke $4 billion in sales last year.
So there you have it. We have an expressly and celebratedly Christian company, exactly the sort who claim charity is enough and that we should "teach a man to fish" and "he who works eats," taking upwards of 65% of their workers labor while not giving them enough to take "fishing lessons" or eat.
So yes, I will say charity is not enough, and that many Christians are betraying the theory on their own. When your charity doesn't cover your
own workers, then it is not enough.