I don't know if $75 is a good price or not - have to figure out how much fabric is included. I can't say it's too much, because I don't know what you're actually paying for.
As far as the pattern is concerned, the only way it's available is in a book, right? So if they included the pattern with the kit, that would increase the price by $25, because they'd have to put the whole book in. Then what if somebody wanted to buy the kit but already had the book? They'd be complaining because you can't buy just the fabric!
There's nothing that says you HAVE to buy a kit. If you really want to make this particular quilt, can you either figure out the pattern on your own and buy your own yardage or buy the book and buy the yardage based on the directions in the book? Whatever you decide - good luck!