Ok, I'll take a closer look. Just for reference, many studies have been done which show that for every bit of information you ask for, you'll get a magnitude of

Ok, I'll take a closer look. Just for reference, many studies have been done which show that for every bit of information you ask for, you'll get a magnitude of people drop out. So though these may be "nice" they're probably best left for later in the relationship. Get the email, so you can hit them up, and get feedback or whatever, but think of it like a relationship. You're asking all of these details, AFTER you've asked about what books we like and don't like. I've already given you a TON of info, and you've given nothing in return, and not promise of what you will give. Let somebody enter the books, then give them results right away. THEN you can start asking for more info if they want to make an account, etc. You are going to face a huge uphill battle with the structure you have now. As I'm typing this, I'm even reconsidering if I want to go through all the trouble of entering my books again, because you still haven't shown me that there is any value there. Also, if you're algorithm needs to know my age so you don't recommend children's books, you've got serious issues. I just gave you 5 books I like, and 3 books I don't. No children's books in there, so why would you recommend children's books?