I think it's worth mentioning your total profit probably would go down if you lower the prices while having such a small playerbase, because the only players around to spend are the ones who were willing to pay the exorbitant prices to begin with. The eventual objective is to have a large playerbase which would mostly consist of light spenders. You'd make a lot more money with a playerbase consisting of 10s of thousands of players spending $1-5 here and there than a few hundred players willing to spend $50 here and there. There are more people in this world who fit in the former category than the latter.
As it stands now, you're hampering your growth with these ridiculous prices. Over the time I've played alteil (about 2 years), the number of newbies I've spoken to who were uncertain about the pricing in this game are innumerable. I often never hear from these players again.
I think the best way to go is to just get rid of the randomization aspect of acquiring cards, and instead have a card catalogue of sorts players can use to buy specific cards. The prices should be close to their recycle values. The collectors will still spend tons of money acquiring all the cards and will be a lot more satisfied because they'll actually succeed in doing so, getting exactly what they want (instead of giving up due to diminishing returns and losing money via recycling). The low spending and current free players will also be more compelled to spend, as they'd be able to easily acquire the cards they want. You'd also encourage players to often buy impulsively considering the low prices of certain cards (5 to 30 cents for 1 stars through 3 stars). Most players will not hesitate to spend a single dollar to get a couple cards to try out new things (and this is the type of business model a lot of successful games follow). With this current model, those are spenders and purchases this game is losing out on.
Most players would be much more likely to spend if they're thinking, "Oh that card looks kinda cool, hmm 5 cents/10 cents/30 cents/$1.50 is not too bad" as opposed to, "Hmm, $50 for 24 cards I don't have."