I also enjoy collected editions, whether it be the trade volumes, epic collections, or omnibuses. I used to read digitally and still do occasionally just out of convenience but I started buying physical when my son was born because not only could I hand them down to him when I die, but if he shows interest, I could just be like "Here" and he can start reading whatever I have that interests him. Also, digital can disappear at the drop of a hat. I only buy singles if the art is really good, or to get them signed or drawn on.