I believe PPV sharing is probably the main reason why they haven't come up with a deal yet. Spence's previous PPV buys are a little better than Crawford's. Spence also has more belts to offer in the division but Crawford is the only ATG of the two.
There's no other reasons, Crawford here has to agree with a small share because Spence will not agree with a 50/50 share.
he has more belts and he has a better PPV record in the past compared to Crawford.
We get it, Crawford is also a champion but Spence have proven enough based on the numbers he have.
Aside from that, Crawford should do what it takes just to make the fight happen because he will be inactive for a year already this coming November and I'm afraid that the time is not on his side as he will also turn 35 years old this September while Spence is still on his prime at 32. A 40% purse cut will suffice as he needed this fight more than Spence do and I don't think that he have something to argue with the PPV share because it's clear that his PPV digits doesn't even comparable with Spence's PPV buys.
If they are really targeting the month of October then I do think that they should've been done already with their talks as it's we are now in July, so less time to prepare if indeed the fight will happen somewhere in October.
I think that's just the point though, time isn't on crawfords side he probably doesn't want to just fight for whatever he only probably has a couple more good fights in him. No need to sign as quick as possible. Spence needs this fight just as bad as Crawford does. Not saying it will or be 50/50 but no one knows the terms being thrown around right now for people to just say they should just sign already.