It’s primarily about run size. I’ve learned from machinists that 6061 blanks are only like 10$, and the machining should be anywhere between 20-60. Parts in bulk are maybe 6$, but smaller runs can be maybe 10$ for parts per yoyo. The packaging, anodizing, and all other individual costs add up a bit too, depending on run size. You could get 10 prototypes for maybe 575$, but the larger the run, the cheaper it gets. Besides machining time and complexity and machine quality, this is generally accepted. So, no 6061 yoyo made in somewhat bulk should really be more than 80$ for individual costs.
However, programming the machine can be 500-2000, the software for the design can be a lot too, and getting an artist is also expensive. Not to mention, you have to support yourself and your team, so you have to increase the profit margin. If it the individual cost was 50$ and you sold it for 51$, and the run cost was 1000$, you’d have to sell 1000 yoyos. Most people just make their yoyos much more expensive, so they don’t have to sell as many to make a profit.
Shutter’s are cheaper because they made a lot more of them, they’re expected to be easier sells, and they’re made in China. The ones I have are all vibeless, and play amazingly.