I agree copying is a difference, but for >90% of my own usage, at least for books and films, it's not one that makes a
practical difference. I don't typically watch a movie hundreds of times: I watch it once, maybe twice. So really I only need to loan it, whether from a library or TPB. In theory TPB would let me not only "loan" it, but actually keep a permanent copy for myself, which the library doesn't. But I have no desire to archive hundreds of gigabytes of films I've already watched, so I typically delete them.
Another approach I sometimes take is to buy a used copy and then resell it. This ends up costing the price of shipping + Amazon/eBay/etc. transaction costs. It doesn't really benefit the artist/studio/etc. any more than torrenting it, though, since they don't get a cut of used sales.
With music it's a bit different because I do actually listen to the same album multiple times over an extended period of time, so prefer a permanent copy of music I like.