The 8 GB model isn't the most popular as to suggest that's what most customers want, it's because upgrades are so outrageously expensive that few are willing to pay $400 more for a meager 8 GB RAM extra. If Apple increased the base specs without increasing the price the turnover rate of 16 GB models would be much higher than it presently is. As it is the MBP 15 equipped with 16 GB RAM costs far too much at $1500 USD and the specs of the 8 GB model are so underwhelming that it's routinely on sale for $200+ discount.
If this model is so popular why must retailers consistently put them on sale?
If this model is so popular why must retailers consistently put them on sale?