0 customers = O commission.
That being said I also have a hard time generating new depositors there because they have been around since dinosaurs walked the earth and a very large percentage of players online already have an account there. The other issue is that they maintain a single player account for all properties so even if you refer a “new” player to Lucky Nugget if they already had a Riverbelle account then you arent credited for the new activity.
Referback is a QUALITY outfit, certainly one of the best of the MGS operators which means they are at the top of the mountain in online gaming. I have done really well with them over the years and they are an a++ in my book. But if you arent making money with them BB1 then you SHOULD remove them from your pages. This is a business and if you cant put bread on the table through the partnership there is no use wasting your traffic.