First of all, it would be too much hassle to keep track of when every single item's buy and sell prices were updated, and it would be pretty useless information anyway. Your case is why we have the 25k/30min rule. If your item doesn't buy/sell, use the rule and the margin will be updated when you report to a pcer or on the forums.
Margins are only updated from reports, so it's not the pcer's fault if the item you want isn't updated overnight. It's simply because nobody posted a report showing that an update is needed for that item.
We aren't "lying to people" by not updating the margin, we just don't have a reason to update it until we see a report.

I hope this answers your question.

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