... It's a saying

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I don't literally think they would actually pay any admission or dollar amount for a shot to play across from Nico (since it has to be spelled out for you).
But if I were a former "teammate" who felt someone did my team and I dirty, I would relish the opportunity to both beat said former teammate and make them wish they hadn't done "us" dirty.
It's a competition with competitors, not a gentleman's club where everyone fakes taking the moral high ground. Having a chip on the shoulder, gives a little extra edge on the comp. Also, it's my ponderance to add to the discussion. Does that answer your question?