I got those backwards. Brainfart. Lol. What do you expect from the guy who typo'd his own username?
Anyway.
Because they sell both by weight, and nobody wants scrawny hotdogs or oversized buns. Or the opposite. Whatever. I'm all confused now.
Is that the best way to do things? That's up to you. But now you know the reason.
There's a difference between canon and not-stupid.