You can get lot more of the light stuff.
However, you’re paying (in this case) $7 per pound for spinach. That doesn’t seem like a good deal.
No, I’d rather pay for the items that take time, energy, effort, talent/skill, knowledge and more to prepare. The complex items are what I want. They might be heavier, but I’m paying for the work mostly.
It’s the same for a restaurant – food can be inexpensive at times. But to know how to make something, shop for ingredients, chop, cut, boil, marinade, prep, cook, serve, clean… that’s largely what I’ll pay for.
I thought about making my own pull-up bar too. The materials would be cheap… but how would I bend it to the right shape? Can my drill put holes in that bar? What about the grips?
If you were going to pay someone to make you a pull-up bar, how much would it cost? Just the time would probably be a lot more than a store-bought pull-up bar – forget the materials. Again, it’s the effort, skill, talent, time, knowledge.