It will help him financially but hurt his credibility after he gets wrecked.
So he'll make a decent amount of change from the fight, but no one will ever take him seriously again after he doesn't live up to his self-proclaimed greatness.
What this situation will prove is that Conor is a greedy pig and values currency over integrity.
Disgusting. His cult following should be ashamed.
It will be completely irrelevant to the outcome of any fight, as always.
Don't let that get in the way of projecting your fondness of fake WWE trash talk onto actual combat sport, though.