Problem with these rock solid Eastern Europeans is their lack of commercial appeal as they can't speak very good english or any at all to help promote their fight and their promoters are sometimes poor as well which is why you see them fight other eastern europeans. It took GGG so long to get a decent fight, he was probably 32 before he got a big fight and I don't think he was ducking anyone at that time. He had to fight those below elite level or people who already had a loss on their record and Canelo waited a year and a half before fighting him.
Any decent Americans or Western Europeans will avoid them like the plague. Bellew even if he was still cruiserweight champion would have never went into that tournament, he would have been pummelled by the first decent fighter he came up against, the risk v reward isn't there.
The money won't be great compared to a domestic clash as most casuals don't know who they are. It's much safer for them to fight a domestic, decent rival where they can build their fight massively despite previously being friends, get a big crowd, big money and a big audience on TV, and most likely a rematch for more money.
In the UK, the cruiserweight hasn't really received any coverage at all despite there being some cracking fight and the most exciting division in terms of knockouts, while the super middleweight division has received plenty due to a number of british boxers fighters being involved, fighting against average fighters till the semi-final/final.
