A lot of things in boxing come down to money. In this case I wonder if we're talking site fees and the marketplace? Everyone agrees this is a huge fight, with or without US interest, the undisputed HW title is a big deal. It's also realistically the biggest payday in either man's career and likely the second fight will see the finish of one or both guys. So expectations are likely to be high. Without either giant stadium sized crowds or Las Vegas high roller ticket prices, UK and US are both uncompetitive and out of the reckoning. Only state/oil wealth backed entities need apply. However, there's only a small number of those, many of them related and without competition from elsewhere they have little incentive to bid over the odds for this fight. So the revenue that Team Fury may have been expecting just may not be reflected in the incoming bids. Team Joshua may not be as worried. They've already earned vast sums, they have enormous sponsorships and an established 'brand' to fall back on, they negotiated their deal with Matchroom from a position of strength and their actual earnings from this fight are thus likely to be much higher than Fury's even with an even purse split. Fury on the other hand doesn't have those sponsorships, hasn't made as much money and has yet to prove himself a big draw without a suitable dance partner. He also has whatever constraints Top Rank may have built in to their 5 fight deal. Put all this together with the additional inactivity due to the uncertainty around Fury v Wilder 3 and signing the fight this summer and accepting less than it would likely make in a years time looks less enticing to Fury than it does to AJ.