Heh. I don't see where there was anything FLAWED about my math. All I was saying is that a book of X many pages for Y dollars gives us so many pages per dollar.
Your argument is that at either of those price to value comparisons, you feel the books are worth the price.

Which is a perfectly reasonable thing to say.
I don't have D20 Future yet. I want to get it. Didn't say I wasn't going to get it because it wasn't WORTH it to me.
There was a comment that fewer people would buy a larger book with a larger price tag. I was merely pointing out that, from the customer's end, if the book were increased in page count and price to be equal to D20 Modern in both, it would actually be a BETTER BUY.
I would have been HAPPIER had the book been larger, and would have been more than willing to pay for it at that price. I, personally, think things like the Menace Manual and D20 Future are a little light on the page-count for being only 5 bucks less than the CORE BOOK. If they were, say, 30 bucks apiece ... I'd be happier. They're not a bad buy, but when you get a book that's something along the lines of 1/2 the size of the main book, but is over 3/4 the price.
I'm sure there's a thousand very good reasons ... minimum print-run costs, sales predictions, etc. It costs "this many" dollars just to get a print run DONE, regardless of the page-count, etc etc. So I'm sure a supplement like this IS over-priced compared to the core book.
I'm a pretty big Alternity fan and I figure this is going to be alot like Alternity in, hopefully, lots of good ways.
I understand that the places where this is a little light gives rise to more support from 3rd parties, which I like to see ... still, if I could have paid 40 dollars for a book with more stuff in it, as a consumer with very limited funds (I'm a GRAD student, for God's sake) I'd much rather pay WotC 40 bucks for all of it in one HC than 35 bucks to WotC and 6, 12, 20, 25 dollars to 3rd party folks.
Just saying what's on my bottom line. Less price, more entertainment is ALWAYS good for me.

Which is why I like RPGs compared to things like, say, movies and video games, usually. Two movies for my wife and myself is < 4 hours of entertainment for almost as much as d20 Future, which I'm sure I'll use for more than 4 hours.
--fje