Like many others here, my optical drive primarily used for ripping content, not for playback.
Because I mostly listen to classical music and opera, finding cheap physical media is quite easy (thank you Second Spin) and usually at a price that is less expensive than lossy digital tracks at the iTunes Music Store. There's always the library as well.
I only have a few Blu-ray discs but they can be ripped as well. Although forum policy forbids people from posting links to documents describing this process, a good search engine will guide one to tutorials on how to do this.