Market share....as a long-term strategy anyway, is not about the sheer number of GPUs sold to a few users.Funny, I'd have thought selling every card they could make was a great way to gain market share. Perhaps you can find an economics major and ask them.
It is about maximum exposure, with the initial purchasers stating how good the products are thereby causing a 'rush' of potential customers to switch from the competing product.
Hence....market share.