Not so, several planets have vegetarians designated[1] that meet the stringent criteria. Each year planetary census data highlights the meat.you still have to capture them, store them, - a process that is complicated by the fact that they would know they need to escape...rather than be entirely unaware like farm animals.
You'd have slaughter them and process them.. a process that requires not just de-clothing but also a lot of testing... since humans not "farm grown and raised" will likely carry all kinds of diseases that you wouldn't want to cross contaminate all of the product.
that's a prohibitively expensive venture. One that is oddly out of character for a slave using, drug dealing, law breaking organization.
[1] They don't know that though
And sometimes you need to spend money to make money. Walter White could have made sloppy product, but he had pride in his work. Here at Kumo Burger we have that same pride in our food.
We are a lot like Gus: