And I don't see why I'd pay to top up here as opposed to buying a pay-once-and-play-forever card game if I want a card game.
I just don't see why I'd want to pay $10 for 10 runs at minimal quality, just over 4 games at maximum writing quality and minimum artwork quality, or under 2½ games at maximum quality. Just from a cost-benefit analysis, this seems like a really unwise use of my disposable income, when I can spend $20 a month on ChatGPT and use it as much as I want.
Also, I don't think you realize how little having a full card game integrated in with ChatGPT is as a selling point. With a freeform RPG, my choices are literally limited to my imagination, whereas with this card game you've included, I'm literally locked into decisions based on the cards I have in my hand, even if those represent decisions I wouldn't make in the situation. Essentially, ChatGPT is substitute for a living GM, whereas having to play within the framework of a card game restricts my decisions to much smaller number of choices, and as somebody who comes from a tabletop RPG background, I don't find that to be a good thing.
Also, I don't think you understand how cheap $20 a month for the versatility of ChatGPT is compared to $1 a run at minimum quality of your game is; you've already mentioned using ChatGPT as a substitute GM, but you can also use ChatGPT to do math, code, generate images within its guardrails, expand on your creative ideas, edit your writing for grammar and spelling, etc.
Which is really just a really roundabout way of saying, I don't think your pricing model is very good.