I'm in the UK - I don't think our market can support higher margins (cost to import fabrics is relatively high), so just curious.
Context: trying to understand the design market.
The reason for this is that by just summing your costs you louse sight of how various areas are performing, and you also lose the ability to compare. If you become a better buyer your gross margin improves, but by employing a picker it stays the same, however type warehousing costs do increase.
So in essence when most people say 'margin' they mean a simple sales-minus-cost-of-goods-sold.
Disclosure: I'm in finance at a retailer/wholesaler who is doing around 5x what the article is doing on ecommerce, it's smallest channel (about 1/20th of the company, but growing)
The flat rate shipping under $45 in this example is probably because it costs nearly the same to ship half a yard or five yards; shipping 20 will cost a good deal more, but not be anything like 20 times the cost of shipping one yard. So there's no way to bake in a price that doesn't end up generating absurd results either for you, your customer, or both.
But, you can do that if it doesn't fly too much in the face of customer expectation. In some industries, like printing, it's common. In fabric I think there's a strong expectation of a single price per length unit, though I suppose you could challenge it.
I don't think lots of price tiers is a good customer experience, so I decided against it as a long-term customer satisfaction strategy. I do wonder if it's costing me sales. Maybe I should set up an alternate brand that does tiered pricing and free shipping.
[source] https://www.nickkolenda.com/psychological-pricing-strategies...