Wow, there's a lot to respond to. I'll just go through paragraph by paragraph.
1. I think I like the Silmarillion better because it is the origin. I absolutely love the first chapter, and sometimes will just get it out and read it to myself. It is utterly beautiful. I am very interested in beginnings and histories. I am 17, and homeschooled, and take pleasure from reading the hardest stuff possible
2. Congrats!! I wish you well. One thing that helped me a LOT when I read the Silmarillion is this: I got the tape version from my library and read it along with the tapes. Make sure you don't get an abridged one. It makes it go so much faster and easier. You don't have to spend 2 hours on a half-page because of pronunciations and figuring out who is who. The narrator doesn't stumble on names, so you can learn to say them like he says them. Because of this, I can fluently speak everyone's name in the Silmarillion. Then you can also spend more energy on paying attention to the actual story. It makes it a lot more enjoyable.
3. You have an interesting point here. You like having backstory in a story, and the reader not necessarily knowing what the backstory is. But just the fact of it being there helps. With me, I also love backstory, but I want to KNOW the backstory. I cannot sit by and just let the little references pass by. I have to know every bit that exists in the history of the world I'm in when I read a story.
4. Let me see...what DID I do? lol...If I remember right, my mom read me The Hobbit when I was little, but I never went beyond that for a while. When FOTR came out in theaters, I was too young to go see it. My dad and bro told me it was based on a book written by the same guy who wrote the Hobbit. So, since I couldn't see the movie, I decided to read the book in the meantime. Haha, that took a LONG time. I think it took about a year (me being about 9 or 10). Of course, much of it went over my head, and I remember skipping a lot of the chapter "Elrond's Council."

When I finished that, I was kinda overwhelmed. I didn't want to read any for a while. Then, I asked my mom if I could see the movie. She said no, and so I looked on our bookshelf for more books by Tolkien. I found the Silmarillion, and my bro said it was very hard to get through. So I decided not to read it just then. After that, I just waited a few years until I was 14, and I saw FOTR. In the year after that, I saw TTT and ROTK, and also read the Silmarillion (with the tapes). The movies kind of spurred a new longing for Tolkien in me, so I began looking for Tolkien books at the library. I found a book called "The War of the Jewels." It looked really cool, so I got it. I then looked inside of it, and realized it was 11th in a 12-part series. I was like, "woah. This is huge. It'll take me forever." (I imagine Christopher Tolkien said the same thing when he started out on his journey of writing the beast.) But I set myself to reading the whole series. I began looking up the books at the library, and it only had two others. So I decided to buy them. Here is the full list:
I. The Book of Lost Tales, Part 1
II. The Book of Lost Tales, Part 2
III. The Lays of Beleriand
IV. The Shaping of Middle-Earth
V. The Lost Road and Other Writings
VI. The Return of the Shadow
VII. The Treason of Isengard
VIII. The War of the Ring
IX. Sauron Defeated
X. Morgoth's Ring
XI. The War of the Jewels
XII. The Peoples of Middle-Earth
I am currently almost done with #7 "The Treason of Isengard." I own every one of them, and have a whole shelf now devoted to Tolkien. Anyways, that's my "Tolkien testimony."
5. I see your point. But there are those out there, like me, who want to see all the backstory. They are hungry for Tolkien films. So if someone made films out of the whole Silmarillion, their hunger would be, at least temporarily, satisfied. But if someone only makes the "big three" mentioned in previous posts, then there is still a HUGE amount of "unknown" backstory and mystery. I think it would be the ideal money-maker to make the big three, and not any others. But as a Tolkien nut myself, I would go to see any movie taken from the Silmarillion.