To Marco:
If you think 'discount' and 'payment' are the same thing, I have a proposition for you: Come and work at my fly shop, and instead of the paycheck my other employees get, I'll give you 15% or what the heck, 20% off everything you buy from my shop. NO LIMIT! you can buy as much as you like!
If you still think 'discount' and 'payment' mean the same thing, I've got one thing to say: YOU'RE HIRED!!! Bring your friends too. I'll 'hire' them for the same 'pay'.
As for your P.S. Where did I ever say discounts should be made public?