Its part status, part make money.
He owns - value dollars
Denver Nuggets - NBA (valued around 800mil)
Colorado Avalanche - NHL (300mil)
Colorado Rapids - MLS (100mil)
Colorado Mammoth - Lacrosse
LA Rams - NFL (2.8 billion+)
and is largest shareholder in Arsenal
There is a feeling amongst some US based sports analysts that european footy teams, especially premiership ones are quite undervalued and ripe for massive increases in value in the next decade.
He could cash in on Arsenal, sell to Usmanov, but then he'd just buy another club. Or he sits on Arsenal and hopes its values rockets.
From Usmanovs view, maybe he's trying to put pressure on for a sale, or a compromise, or wants a counter offer from Kroenke