I think Daredevil is on TV/Netflix rather than a film because that's simply how Marvel is wanting to expand their universe. They can't release that many films a year and want to rapidly expand what they're doing, television is their obvious option there. They are just replicating what they did with Avengers by doing Defenders on TV. I don't think that necesarilly indicates that Daredevil is a smaller property than any of the ones they have made or are making films for. It is just the direction they are choosing to go with. Now, Daredevil himself also typically has smaller scale stories that are less, well, fantastic. That inherently lends itself to the television format better than something like Iron Man which would require a large special effects budget and likely come across as cheap when spread over 13 hours. I don't think that means Daredevil is less valuable though.
I disagree with the notion that the Fantastic Four are more valuable. They are a bit more requiring of a larger budget due to the special effects needed for their powers...but that doesn't make them more valuable. Like I said before, they didn't get a third film for a reason. A new film is being made (supposedly) now for a reason. Neither of those reasons are because the property made them a ton money in the past.
The Fantastic Four are not Spider-Man or the X-Men. People just honestly don't care about them. Even if Marvel gets them back, pretty much everyone agrees it's unlikely that we'll actually see a Fantastic Four film out of them.