Exotics too, if it's not an Exotic you use often, you can make due with a collections roll. It's cheap to MW if you're at the point where you have multiple builds, and weapons are just weapons, if there's no high kill tracker, you don't need to worry about pulling (Hawkmoon, DMT, and the craftables non-withstanding).

Shit purples drop like candy too, so infusion fodder's not an issue.