The sales of the 358 Winchester and 222 Remington Magnum would never increase even if the brass was priced the same as 308 Winchester and 204 Ruger respectively. Why? Despite how good it's alleged to be, the 358 Winchester never caught the attention of many shooters. In fact, .35 calibers in general aren't nearly as popular as the .30 calibers and never will be since the .30 calibers have such a head start and work so well.
As for the the 222 Remington Magnum; it's on crutches and ready to be buried. It's not because it's a bad cartridge but it's to close ballistically to the 223 Remington which is so popular and for which brass is so cheap.