@wmarone: Yes, but they'd run the risk of potentially generating ill will in the long run with a significant price difference.

$2.99 for 3 level packs on Maemo
$1.99 for 5 level packs on iPhone (But it's been available longer at the discounted price of $0.99 than the full price)

@Elhana: I don't know about that. It sounds to me that their marketing departments have been pressing the right (pavlovian) buttons that some customers throw caution to the wind and act on impulse purchase that they later regret and look for something to blame on.

You can look up the statistics of impulse purchases to find out more about this sad fact.