It's like going into a fast food place and finding a super big gulp for 1.99 and a mega super big gulp for 2.29. It's only 30 cents more, but it's water and syrup. The whole thing cost them less than that to make.
My neck is only one size. I get my shirts with the same style collar. I don't need the short stays at all and I'd be perfectly happy paying for a box of 2.5 inch stays and nothing else. If I bought these, I'd be getting 100 stays. I'd be getting 50 more that I could go against with a toenail clipper perhaps.