Don't know if there is a way to tweek how often we get learning upgrade cards, but they seem to be a bit out of balance/slow in being offered. I'm nearly done with all the Animal Skills, but was just offered level IV for Animal Learning. By the time I get offered level V, I will have probably learned all the animal skills. Seems like I'm closing in on learning all the skills in other areas, and still have a few more learning skill cards to purchase for each of the areas. Hoping that I don't learn all my skills before I am at least offered all the skill learning upgrade cards for these areas. Would be a waste of iMG that I sorely need for my quoin multiplier and energy tank to spend them on skill learning upgrade cards for sets of skills that I've completed.