I agree with this 100%. Keep the rarity/value the same and offer $1 5 card packs next to the $5 25 card packs. I bet anything you sell way more $1 5 card packs than $5 25 card packs, even though value is the same.
I am also still VERY concerned that cards are way to expensive overall, and that this price barrier will prevent the mass influx of new players we so desperately need. I hope I'm wrong about that, but I think the game has become way to expensive to ever expect 1M players unfortunately.