"Collect"? No, no more than I "collect" fountain pens.
I buy recorded music on CD to actually listen to (and in the case of my annual Christmas bulk order auditions, I buy every new-release CD prominently featuring an organ that's at least predominantly real pipes, on at least predominantly direct tracker key action, in order to select the one that has the best combination of mass appeal, quality of music, quality of performance, and a good demonstration of the subtle nuances possible when one is able to directly control wind-onset, and therefore note envelope transients. And I have more than a dozen feet of shelf space devoted to my CD library (and another three feet to vinyl, much of which has never seen a CD release). But "collecting" implies either investment, or completism, or both (I will admit to a certain level of completism with respect to the recordings of mezzo-soprano Joan Morris and her pianist/composer husband William Bolcom, just as I'll admit to a certain level of completism with respect to books by certain authors, and to ST books, but not in general, and if I de-accession a CD, it's invariably because I'm giving it away.
I likewise buy DVDs (season sets of ST, Emergency, Banacek, Quincy, and so forth included) to actually watch, but not as "collectibles." And as I recall, I don't currently have a functioning Blu-Ray player in the house. Multiple DVD players, though. And so I have only a couple of movies on Blu-Ray, both of which I also have on DVD.
And generally, any fountain pen that sits in a drawer instead of in my breast pocket is one that I retired, or that somebody gave me in complete disregard for my taste (which is why I have a Parker 25 that has only ever seen service as a "backup" pen), or that I bought, only to find it completely impractical to actually use.