Hi Freder,
I think your deck looks awesome and you are clearly a very creative person.
I was sad to read your (understandable) response to the news about the other circus decks being released.
Although I have no direct knowledge of card publishing, I have intimate knowledge of the publishing industry and this leads me to note a few things.
First, the publishing cycle tends to be much longer than anyone outside of the industry thinks. I suspect they had those decks in development before you approached them.
Second, if they say the resolution is too low, either it is or it isn't. You could simply send a full resolution file or inquire about their technical requirements. If there is a real issue, you can learn from it. If there isn't, you might still have a chance to get it published.
Third, if Circus decks become popular, perhaps all boats will rise. Many of us, if we like a theme, will get all the good decks of that type. This may actually lead you to greater success rather than less. People who have never heard of your deck or books are more likely to find out about you because a mainstream publisher has put out a circus themed deck, let alone two.
Fourth, if the two decks they have out do well, they might be interested in picking up a third. But this can only work if you keep a good relationship.
Being angry only hurts you and impacts your ability to be creative. If you let this stop you, you will just be stopped. This is only one of the many creative efforts you will put forth in a very creative life.
I hope you will continue to produce other interesting decks.