I thought Storj charged clients a bit more for Select… but offered the commercial SNOs a bit lower $/TBm as they had the scale to still make money at the lower rate (and could fill faster without the /24 restriction). See: “Because of the scale at which they operate they typically accept much lower payout rates because of the efficiency of their operations”
Select is a premium tier of service… so it makes sense that Storj can earn greater margins from it. Though in this case the 10PB customer would have custom pricing… so they may not pay a penny more switching to Select.