Reasons not to install aluminum fixtures: It's no secret that profits per unit are generally gonna be higher when using more durable (more expensive) materials, depending on how you figure your bid. Copper, brass or stainless steel don't take any additional labor to install. Because they last longer in outdoor environments you build your reputation for installing systems that last. So basically, the main reason to install aluminum (or composites) is if budget/ sticker shock are concerns. And that might really give the homeowner a false sense of economy given the comparative life of systems.