Interesting that you say selling things isn't skilled work - when you need to know how to get payments, where to list, how best to list, how to deal with purchasers, what the best way to take payment is, figuring out shipping and packaging. These things are skills, and once you know them, sure, it's easy... but you still had to learn those skills.

While I think it's less time overall to resell than build, for sure, I also think you're stacking the deck by handwaving away the time and skills involved in reselling.