Replying to Custom insoles a scam?

I have flat & wide feet. Got some sidas from the bootfitter along with my vacuum fitted fischers, still had fuck loads of cramps, yet my feet weren't tight in my ski boot either ("go see a bootfitter" turned out to be a big fail for me, went to DutchBootFitter). Did an experiment at an indoor ski piste, cut out a 2dollar flat insole, ski'd with them in one boot and bootfitter custom sidas insoles in the other, had much less cramps in the boot with flat insole, than replaced the custom sidas insoles with flat insoles in the other boot and cramps eased down A LOT.

What is the rationale behind insoles that have the exact shape of your feet anyway? Why should you equalize pressure all across the foot? Isn't it only normal that you stand on your heel and the part before your toes (mtp joint)? And that there is no pressure in the arch of your foot? (So no bump in your insoles either) In nature you mostly walk on flat surface, not on surface that has the exact same shape as your feet. I DO believe in equalizing the pressure on the leg and over/around the foot, and removing pressure points in these parts. But I don't get the rationale behind equalizing pressure below the foot, it's not natural, and standing on a flat surface is what worked the most for me.

**This thread was edited on Jan 4th 2019 at 11:47:44am