The only reason he doesn't take that fight is if it jeopardises any fight with Joshua in the future. For all the hype and talk around Fury over the last few years, people forget that he's never actually had a massive pay day in his career. Even the Wlad fight, he'd have only received around 25% of the split. He's in it for the money and is probably going to receive more from the Wilder fight than he's made in his entire career.