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(Picture unreleated: Sucks Charizard is still Fire/Flying, but understandable with Sky Battles limitation)
Yes, it's a rip off. Math found at /r/pokemon/comments/1lsbab/a_question_about_x_y/cc2lzat
I determined that Nintendo has a 10,000,000% mark up on the service, from a hardware perspective. However, yes, electricity costs and staff costs (less than 10 people likely ever worked on Bank/Transfer) impact that number.
Anyone disagree with it?