I do so on a regular basis when I see a good sale. On average I spend around 10-13 usd per movie, though I have to spend more for marvel releases.
Before people say it's a waste of money, I'd just like to say that I only buy movies I've seen and know I like, never at full price, and I have a home theater setup that fully take advantage of the dolby TrueHD or DTS-HD Master Audio, so I literally need to download 35-50gb files to get the same experience.