Why is Wagyu so rare?

Online Answer
Wagyu cattle can be consistently raised and bred at a relatively large scale, so how could it be rare? The answer is that Wagyu is the highest caliber of artisan beef, produced in small quantities and closely governed by Japanese guidelines, and it is this exacting process that makes it so exceptional..
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Side Dishes: Choose Light Over Heavy Neutral vegetables such as leeks, sauteed mushrooms, or baked potatoes pair nicely, as well as something crunchier like lightly seasoned green beans, asparagus, or broccoli. Salt, pepper, olive oil, and butter are suitable seasonings on any side dish of your choice.
While American Wagyu cattle are still known for taste and marbling, he said, "they won't reach the extreme levels of marbling like they do in Japan, due to the different feeding systems." ... The Japanese cattle are far from perfect, though. "The breed has some weak points. Muscling would be chief of those," Olson said.
Not only does wagyu beef have higher levels of intra-muscular fat, or marbling, but the meat texture is finer, resulting in a more flavoursome eating experience. A 'super beef' of sorts, wagyu is known for its marbled appearance and for being so tender it actually melts in your mouth..
Myth: Wagyu is too fatty. The facts: Wagyu has a particularly rich mouth feel because of the marbling of the fat—not because it has an overall higher proportion of fat than American beef. ... The fat is evenly dispersed throughout the beef and melts at a low temperature, which gives the steak a buttery texture.
... The fat is distributed more evenly throughout their muscle, which is why wagyu beef looks pink and tastes so tender.