I was looking at the monthly prices for Lorwyn uncommons and noticed that Imperious Perfect had gone up from $1.60 when I checked about 10 days ago to $2.70 this morning. When I switched to the weekly listing it showed as $5.29!!
When I went to ebay to verify this for myself, I found that there were a lot of PROMO Imperious Perfect being sold for this kind of price, but the regular ones were going for a lot less. Verifying the High price against the ebay sales confirmed that the auction was for a promo card, not the regular version.

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"If you're right 90% of the time, why quibble about the other 3% ?"
"I intend to live forever. So far, so good."

Promos need to be excluded or listed as separate items.