I understood PP's concern to be about excessive flash wear due to swapping rather than tiered memory pricing. Regardless, "markup" probably isn't the right wor

I understood PP's concern to be about excessive flash wear due to swapping rather than tiered memory pricing. Regardless, "markup" probably isn't the right word, since Apple is the supplier of its own SIPs. DIMMs would likely be cheaper to the end user per gigabyte (and possibly upgradable!) but it's not really an apples-to-apples comparison vs. in-package memory. Flash storage is perhaps a better comparison and it certainly isn't cheap, but you can easily add fast Thunderbolt storage.