Teofimo Lopez is one of the biggest stars in America in boxing but also recently became a promoter himself.
Different promoters, TV companies and streaming companies pay fighters at the highest level differently.
Lopez has lifted the lid on it all as regards this on X:
“I WILL GET SLICED FOR THIS, BUT this was to drop my first PPV & showcase that I cannot sell in bigger venues. It was against a Puerto Rican, which should have been hosted in New York, not Vegas, NV. #Boxing The boxing business knows what happens IF/WHEN I miss the incentives’

Very intesting.
While not ubiquitous, it gives boxing fans an insight into how the pay per view, gate receipts/ticket sales side of the boxing business actually works.