Confession #1: I don't like the peach cheap toys. The base set totally clashes with the other base sets. You have these bold, vivid colors - blue, green, red - and then with all of that goodness they paired the most bland, fleshy color. It's like getting a $5 box with a burrito, a taco, a chalupa, and a dead mouse. Except at Taco Bell, the mouse costs like 79 cents extra. So to sum up, Taco Bell is awful.
Almost all mini figure toy lines, Keshi, Muscle, etc etc have a flesh or peach color. It would probably be weird if that color wasn’t accounted for. Key fact being it’s a base set color and more than likely the cheapest to produce in large quantities and thus making the other toys chase colors and more desirable.
I'm sure it made business sense for Topps to do peach as a base color. And peach on its own isn't terrible (I have plenty of MUSCLE figures and I love each of them in an almost unnatural way). But I do think that the peach toys don't look so great when displayed alongside the other base colors. Orange would have been a better base color for this purpose.