TommyDee
Vaporitor
The crimps in the cap came about due to the number of 'loose cap' complaints that came sailing in after some big sale. The entire run had no crimp and most fell off when they took them out of the box. The captive cap was born because people couldn't pinch the cap to secure them on their tips.
There was probably also a hidden agenda in that tips and caps are not readily interchangeable if you optimize the fit of your cap to a specific tip, it might fall off another and fit tightly on a third. Captive caps allows for more variation in the tip's outside diameter. For me, optimizing a cap is being able to pull it easily with a relatively small magnet, but it never falls off, even when flung.
There was probably also a hidden agenda in that tips and caps are not readily interchangeable if you optimize the fit of your cap to a specific tip, it might fall off another and fit tightly on a third. Captive caps allows for more variation in the tip's outside diameter. For me, optimizing a cap is being able to pull it easily with a relatively small magnet, but it never falls off, even when flung.