3.5 contains a contradiction on this point.green slime said:IMO, the main weakness of wizards isn't their spellbook, it isn't their crappy hp. It is the cost to scribe spells into the spellbook. Haven't glanced at how 3.5 solved this issue[...]
A spell takes up one spellbook page per level. In the magic section of the SRD, it says that adding a spell to a book costs 100 gp per page.
Yet in the description of the BBB, it says the owner can fill it "without paying the 25 gp per page material cost." Incidentally the item now costs 12,500 gp and has 1000 pages, which works out to 12.5 gp per page. If 25 gp is the correct standard cost, it looks like the BBB is intended to cut the wizard's scribing cost in half.