Used to work in garden/hardware supply company. The best selling product cost $16 for manufacturing and delivery to our warehouse from China. They would sell in [national hardware chain] for $699. It was about a 40% markup in store, the rest of that $699 was eaten up by warehousing, shipping and staffing costs. If you couldn't move that product in a reasonable timeframe then you'd start losing money on warehouse costs.
I figure most items I've purchased are 40% profit, 50% warehouse/shipping/staffing, 10% manufacturing/import.
Not surprising. There's a part of the Shopify careers site that has a letter you have to acknowledge that says (paraphrased): Care more about the ability to sell than what people sell, and if feel you might disagree with what people sell then this isn't the workplace for you. They really drill that point home on the site and in interviews, not surprising their stance is 'no comment'.
(I didn't get the job)