You can't just blame the mediocre downloads on the game being solitaire or a card game. You say yourself there are 14 free solitaire games which are getting more downloads, and checking the App Store in the US there are 140 free games ranked higher than your game in the Games/Card Games category.
Those games all have the same "problem" that your game does in terms of demographics.
I also said I didn't have any proof that other games were getting more downloads. It was just a statement based purely on my own opinion.
But anyways, it's pointless to continue this conversation. I've learned a lot. I can't say that our game is perfect...no game is. Going back, I think it's kind of stupid on my part to have started this thread :P
Edit: Besides, I'm in no rush to buy any games from others developers