A business that makes money ‘except for..’ doesn’t make money. A business that doesn’t make money has no value (apart from as a building block towards a business that makes money)
“I think people will buy X for £Y. I can get/make X for 0.5(£Y)”
Maybe let’s try that without the algebra:
“I think people will buy titanium iPhone cases for £100. I can get titanium iPhone cases for £50.”
“What do you do?”
“We send out a £10 note every month to each of our members”
“How much is membership?”
“£5 a month”
“Dude, no. Stop that.”
Mostly, it’s bullshit.
If your product is something people want, you will be selling into a vacuum to start with. Those will normally be the easiest and cheapest sales you ever make. Margins don’t grow, they erode.