The odds of getting one in an Opening Day pack were harder, plus the set is smaller so people didn't buy as many boxes as other products in my opinion. But yeah, the Opening Day product is as low-end as you get with Topps.
I am interested in the A-Rod Gold /99. I have these Mets to choose from;
08 Sweet Spot GU Jrsy pedro Martinez #SS-PM
09 Topps Update Gold #UH244 Santana /2009
09 Topps Gold #551 redding,550 Beltran,430 F.Rodriquez,621 Perez all /2009
09 Goodwin Mini Black #9 Delgado,113 reyes
nice selection to choose from
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In the Opening Day the Arod cards were inseted 1 per hobby box and very random in the retail. 1 per every 2 or 3 blasters. I believe I got 3 out of 10 blasters I bought. Most of the other products yielded 2 or 3 per box or 2 per box topper. The higher end products carried a higher value than the base issues, but the Opening Day was the toughest pull by far. I have openend a ton of it and still need several.