Impressive, Mac. I used to make suet cakes, but my local grocery store went from selling suet very inexpensively to now charging so much it is no longer cost effective. I just checked the ingredients of a commercial suet cake (usually about $1/cake or less): suet, corn, milo, wheat, millet, peanut parts, sunflower seeds. Nothing suspicious in that for me. Made in Oregon. I think the package is recyclable (I treat it as such). I get chickadees, woodpeckers, flickers, jays, and various small brown/gray birds on a regular basis.
I also provide chicken scratch (a blend of cracked corn and oats) in a open feeder and the least expensive mixed seed in a tube feeder. Some birds are more picky than others, but what they kick out the ground birds eat.