What do people do with cows?

I live out in a rural area and i'll see like 30 acres of land with maybe 20 cows out in the pasture. Pretty sure i've seen the same cows the last few years. Do they all get turned into beef eventually? I just don't see enough money in this to cover the cost of the land, property taxes etc. Same with all these empty lots. I can drive out to central texas and see 100 acre farms with nothing but grass unless they're bailing hay out of these fields.

What do people do with cows?
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