I thought from what I read that the 204 for ROTD was that there were 204 remaining, indicating 96 sold at that time. Every game had at least 70 preorders. Maybe Shawn could clarify, if he ever chooses to clarify on this matter.
And KOF 2003 sold out sometime in early-mid 2006, at least the English AES release. The stock was listed throughout 2004 and 2005 on archived versions of Neostore pages.
You could very well be right about that... maybe it just seemed like it sold out quicker to me since I procrastinated buying it, thinking it would sit there for years like KOF 2001 and 2002.