Because it is possible to learn Level 6, 7, 8, or 9 spells. Not in BG1/ToSC, of course, but if you take your character further into the series, you will find those spells. I realize that those pages of the spellbook will always be BLANK in BG1 (unless you're playing Dark Side), but the alternative--having one's spellbook stop at page 5--implies that there are no more spells to learn, and would almost be a nod to the EXP cap, another way of saying "This is as far as you can go in this GAME."
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Volothamp's Comeuppance
Everything you ever needed to know about the entire Baldur's Gate series......except spoilers.
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