they'reHISchickens :
I'll chime in to say that one company's scratch is not another company's scratch. I've purchased scratch from local mills that is a good variety of mostly whole grains and could very well be a fairly good diet. Then I bought a bag of Purina scratch and was totally shocked at the amount of corn in there! I suppose even the local mills vary the amounts of grains in their scratch depending upon the season.
I agree that layer feed is just all these grains ground and formed with some minerals and vitamins added. The question is what proportion is what grain and how much is added filler or other unmentionables.
If you don't have access to variety, you may as well buy the layer pellets. If you have access to a good variety of healthy grains and supplements, study the subject and formulate your own ration.
One size isn't going to fit all, folks, and everyone's mileage will vary

And really, if you have to pay $25 a bag for layer pellets, maybe it's worth it to feed cheap scratch and not get eggs for 4 months a year. Store eggs can be real cheap eating on sale. Some people live on lobster and some live on really fatty hamburger. We all do what we can.
..and if you had told me how much we would spend on these darn chickens, I'd have told you you were crazy. They's CHICKENS! yeah, but I guess they are sorta cute
I never thought about that, but you are right. I bought scratch once at
TSC and it was only cracked corn and three other grains. The scratch we use is a 7 grain scratch.
I still think they do better with pellets, but a quality scratch might not be as bad as that 3 and 4 grain stuff.