With both cards on the battlefield, you can draw as many cards as you want and deal that much damage
They have a vested interest in maintaining/expanding their business so just like card grading companies, they understand it's ideal for them to "create value" out of nowhere and if an auction sets a new record, it's not like they have to worry about due diligence to see if the price made sense or who the seller and buyer are and if they have a preexisting relationship or what, they just take their cut and that's it.
Graded Population Report: Charizard [1999-2000] #4 Visualize the distrbution of grades in the chart
As the last ability resolves, sacrificing a creature or land isn't optional
Delivery Lots will only be released once payment in full has been received from the Purchaser
But then you just have to look at the Alpha cycle of 1 mana coloured Instants: Healing Salve, Dark Ritual, Ancestral Recall, Lightning Bolt and Giant Growth