"I do not mean to be a jerk, but do enough people buy blu ray for them to turn a profit, with dvd, digital, Amazon Prime, Netflix etc?"
Not a stupid question at all. I'm in the home entertainment business and there are times when Blu-ray sales exceed the DVD sales...usually it's the other way around. That said, offering both DVD and Blu-ray will generally bring you more money. BILLY ELLIOT LIVE was released on DVD and Blu-ray in October and the Blu-ray sales are currently half of what the DVD has sold, but it all adds to the bottom line. The numbers seem to support a Blu-ray release of these musicals.
The other thing to note is, for the people that care, Blu-ray exceeds the quality of HD content streamed on services like NetFlix, etc. There are bandwidth issues with streaming that are not a factor with Blu-ray discs of the same content. I think that there will always be "collectors" in the world...which is why physical books are still published even though you're able to receive them electronically on devices such as the Kindle, etc.
A well done Blu-ray will trump a DVD or streaming service all the time both from a video and audio perspective...for now.