I have a reasonable number of dvd or bluray box sets of old tv programmes, I think all either UK or USA shows. Some were gifts, but most were ones I bought myself because I loved the series.
Some are the classic 1960s UK shows like The Prisoner, all Gerry Anderson, Randall and Hopkirk (deceased) and the Avengers. I even have a full set of Raymond Burr Perry Masons which I have watched (not UK, I know) and My Favorite Martian..
One of the reasons for buying box sets is that here in the UK, many American series don’t get through to the end. Examples include Once Upon A Time and Archer. They may lose some popularity in the USA but still have a large number of people watching. Here in the UK, if a series is not so pupular it gets pulled.
Another reason to watch the boxes is the lack of advertising. An hour long show can, in reality, be just 40 minutes of tv.
I watch them through, one or two each night before bed time. Recently I watched Pushing Daisies, The Wire (which I had never seen before, Battlestar Galactica (the reboot) and now have moved on to Alias.