You can check yourself. I’m pretty sure the “cafe cards” amount to around 3-8% of the lowest end cards depending on whether we consider 1650 and 1060 as cafe cards. Obviously also excluding integrated cards because those I didn’t consider in the first place. On the other hand the current gen and last gen low end cards (xx50 and xx60) make up 25-28% of the market.
Also I don’t understand why you’d want to exclude cafe’s from the potential market? It’s not like internet cafes don’t upgrade their hardware. When they do upgrade they’re definitely going with the low end cards.
How much RAM do you imagine internet cafe machines use? 8gb? 16gb? 32gb?