> as capitalism only benefits, those who own
A rising tide lifts all boats, and that is what has borne out by historical fact for capitalism. The easiest way to see how it benefits everyone, even the poorest, is to look at the median person's living standards in places that don't have "capitalism" (which in this context is shorthand for rule of law, strong private property rights, and a market economy).
> a few thousand people hoard all the resources
The mega-ultra-rich (the top richest few thousand people in the world, like you said) aren't piling vaults with gold, Scrooge McDuck style. Their wealth is the productive assets they own, almost always companies that generate value for consumers.
Besides, the net worth of all American billionaires combined is about four and a half trillion dollars[0]. Even if you could magically confiscate all of that "money" at that same valuation (which you can't, since you cannot liquidate a stock and expect it to fetch the same price) and redistribute it to everyone, that's a whopping bonus of $13.5k to every man, woman, and child in this country. Do you seriously imagine everyone can stop working and live happy lives with that money?
Put another way, $4.5T is not even five years of Social Security. What happens next?
> we have to keep working
I'm not really sure what you think the alternative is. As pg said, wealth is what people want[1], whether that's an AC unit to keep yourself cool if you live in a hot place, or heating oil to keep yourself warm if you live in a cool place, or a flight to Paris for a vacation, or filet mignon, or rice and beans, or a can of Coke, or a glass of wine. Every single one of those things takes labor to produce. If all rich people ceased to exist, it will not change the fact that you cannot wave a magic wand and put food on your table.
[0]: https://www.statista.com/statistics/1291685/us-combined-valu...
[1]: http://www.paulgraham.com/wealth.html