Brook has sold out a ten thousand seater arena in Sheffield before fighting mandatories so I'm sure they could do at least double that now. I think he'll definitely do more than twenty and it'll get the massive buildup on Sky and in the media. Spence might not be well known over here but I think any Brit versus "a top American" is a natural ticket seller. There's no doubting Spence's pedigree or his potential and he'll get the big buildup in the media. And the fact it's taking place in a stadium makes it a bigger event and an easier PPV sale.