It's still not bad if you're buying old SAS drives. At this point, anything 4TB or less is fine, and for most people that's plenty to start with.

If you're ripping DVD and BluRay content, you probably will gobble up space quickly without re-encoding it, but otherwise you can store content from streaming services with ease.

That is the unfortunate thing, hosting your own media does take storage, but I still think overall it would be cheaper depending on the amount of storage and how much you are spending on Streaming services. A quick look says people are spending $100 or so on services each month. So $1,200 a year. You can easily build a 30tb array and the NAS for under that, even with today's outrageous prices, as as you find more storage, expand upon it. 30tb is going to host a whole lot of media. Let's say the average 30 minute TV show is 0.5 gb and a movie is 2gb, you can store something like 20,000 TV episodes and 10,000 movies. I think you'd be just fine, and that's a payback of one year. And you can easily share that with your friends and family without paying additional fees.