While your position makes sense, Cabral, the fighter in your example can either keep the sword or sell it. The wizard can do both. He can scribe the spell and then sell the spellbook, with no reduction in the spellbooks value.
That's why I'm suggesting the cost to gain access to the spell ought to be discounted somewhat when starting a higher level character. I acknowledged this would be a house rule, but it seems reasonable and probably a better solution than that suggested above -- play a sorceror rather than a wizard for games starting at more advanced levels.
Also note that the line you quoted was in response to a suggestion that any added spells must be purchased as scrolls. I was seeking clarification of that statement, as it is highly restrictive and not in accordance with the suggested fee in the PHB for gaining access to a spell from anothers spellbook. It also wasn't clear to me whether plane sailing was saying that this was his group's rule for starting characters above first level, or if it was a more general statement as to how his group allows spells to be acquired in actual play. I was under the impression PS was also suggesting a house rule aproach, one which is at least as coservative as my suggestion was liberal, and I was hoping to ellicit some discussion as to why he preferred to limit wizards in this manner.