Is 15000 that bad? Most fights in America are not exactly fought in stadiums. America is also very different to the UK where most of the population lives in the compressed south which is like an 1/8 of the size of a typical US state. The UK is tiny and the US as a whole is huge and quite spartan in a lot of places. Canelo sold 21000 last week, so Wilder at 14000 in a weak division is doing okay. The Fury fight will bring him more attention and then once he knocks out Joshua he is then a star and even then won't sell out US stadiums as the dynamics are different. He would fight in the usual arenas other fighters do.