Maybe "banner" will work with "affiliates marketing".
The average profit is roughly the same that ads in games: 2-3 dollars per 1,000 views.
1.000 views = $ 2,50
10.000 views = $ 25,00
100.000 views = $ 250,00
1.000.000 views = $ 2500,00
CPM $2,50 -> ROI = R$0,00
The problem is to show the game to the right audience, for example: health, education, entrepreneurship, etc.
The advantage is that you do not have to pay $ 2.50 in average to each 1.000 views to make some sale as affiliate of a digital product.