Also, vegetarian food can be really delicious. Go to a good vegetarian restaurant some day and order something that sounds tasty - it probably will be and you may not miss the meat as much as you think!
Just don't think that your choice to try and reduce the price of meat will meaningfully affect the use of meat. It's just more meat for me.
During poverty in Yugoslavia my family and I subsisted on a diet of beans and rice. Complete protein in that combo, enough fiber and calories, we didn't die despite eating that for years.
I'm pretty sure ex-Yugoslavia area has a very good geography, if not better than most countries. You can grow soy there, just like in the USA, you can grow corn, wheat, you can raise chickens, you can do practically anything there, olives, oranges, grapes, forest fruit etc.
What do vegetarians elsewhere eat? Is there a place on Earth where it's cheaper to grow protein by feeding protein to animals, or to just eat the protein directly?
I'm not exactly sure where in the world is rice and beans more expensive than meat? If so, then it's heavily subsidized and is not real free market behavior.
I guess by this logic, since Sahara exists, eating food is a luxury.
Your definition of luxury has transformed into a supreme being just so you can call vegetarianism/veganism a luxury.
If you live in the first world, eating plants over eating meat is not a luxury. It's the cheapest form of healthy sustaining food there is.
One of the weirdest things, for me, is to spend a few weeks eating cheap, delicious, and relatively natural food in Latin America, and then returning to the USA where people get excited to buy groceries that are "made with real* ingredients!".