There's not much Cricket fans in Zimbabwe and number of Cricket fans in West Indies are declining
There are still a lot of Zimbabwean fans out there.
West Indies has recently achieved a good success after beating England in the ICC Champions trophy.
Zimbabwean fans have had their moments in the last decade - beating virtually every one from the 90s upto 2000.
It is us who need more success. Because we have suffered more than any other test playing country in these last 4 years.
P.S. As far as I know, Fans increase with the success of their team.