I never understood why All Wah's were so expensive for a few parts :\
Can anyone enlighten me ?
I can... Hyundai vs. International. Bic vs. Zippo.
Actually, I'll use Zippo lighters as an example. There are so many Zippo knock-offs, and the are made out of cheap sheet metal, crapnasty hollow rivets, and chrome to cover the brazing. A REAL Zippo is a drawn-tube design, brass shell. A REAL Zippo has solid pin rivets.
What does it matter? It's about the quality of a mechanical piece. Just like a Zippo, a Wah has to endure some fantastic abuse. If you look at cheap knock-off Zippos, the flint wheels are thin, floppy on their axle. They usually just fall apart. Wah pedals can't do that. You could have a 500 lb. blues guy standing on the thing, and you don't want it to crack under the pressure. Plus, just like the flint wheel, you are rocking it back and forth... how many times throughout it's life?
And, the only other justifiably expensive part, the Pot. Everything that applies above, is as so below. Except, you also have a wiper scraping back and forth across a carbon track. A little bit of ruggedness built here will ensure a long life.
I'm not touching the inductor. I think that it's no more special than a Fet. Each one varies, there's a range that works with the stock "crybaby" circuit, yada-yada-yada. Hell, heat shrink a nail, wrap a ton of thin magnet wire around it, and tweak the circuit to match, if you feel inspired to do so. The core material, IMHO, has more of an effect than than the wire, but you can make even crap work just fine. But, that's my opinion. I wouldn't go by it, lol.