I think it's not worth it at all.
I don't understand how it's justifiable to raise an animal in terrible conditions, then slaughter them (not always humanely) just because it tastes good. It takes 49 days for a broiler chicken to be killed. 49 days followed by an often painful slaughter, as they are not protected under the Humane Slaughter Act. This provides 3000 calories that could be easily gotten from a plant based source. I don't think this is morally justifiable in any way. Animals aren't treated well. You don't have to watch "vegan propaganda" videos to know this. Things like battery cages and gestation crates are INDUSTRY STANDARDS. They are not made up. Unless you think animals are not sentient, which is ridiculous seeing as it's widely accepted in the scientific community (and obvious for anyone that has ever had a dog), I can't see any reason for eating meat being okay. I understand this chicken example is the probably the most extreme example, but I don't think the it's worth it for pork or beef either (although beef cows live significantly better lives than other farm animals).
The second reasons I am a vegan is for environmental reasons. The meat industry emits more greenhouse gasses than all of transportation combined, not to mention the loss of many forests for grazing land. It's unsustainable, and I don't want to **** over the future because I like how cheeseburgers taste. By the way, these statistics aren't just PETA statistics, look it up.
The third is for food supply reasons. Yes, I fully understand that a lot of people starve because of poor leadership and distribution of food, but giving so much food to animals (that for their sake would be better off not existing) is not justifiable. If we stopped giving plants to animals, the price would go down and a significant population would be able to eat.
The last is for health reasons. I understand that omnivorous diets can be healthier, but I think practically for me, it's a lot easier to be healthy on a vegan diet. The diet is gaining a lot of support among doctors and has been shown to reduce chances of some debilitating diseases. Even if it isn't any healthier, I think it's safe to say at this point that people can live PERFECTLY healthy lives without meat, and seeing as there is no need, the other 3 reasons prevail.
That's why I'm a vegan.