Capacitor size is pretty much set by the technology, but where possible smaller equivalent parts are usually cheaper. You can't spam this in all of your product

Capacitor size is pretty much set by the technology, but where possible smaller equivalent parts are usually cheaper. You can't spam this in all of your products anyway because it makes it too likely that you'd be discovered, plus again there's the issue of making it pass spurious emissions testing. This sort of thing would probably only be used in targeted attacks.