Okay ... so for those who didn't know yet ... you can get discounts if you give those etc drops to the leafre village chief (the old man on the screeny) ... what you do is select the option "Help Leafre" or something like that, he will then show you the list of what he will accept. As far as I heard the lower the item is in the list (ie. the harder it is to kill the monster) the less donation you need to get discount.
Here's a screeny proof ... mine is at 24k now, and so far I think I've donated about 1500 total of mixed bag etc items. Mostly red kentaurus flames (about 700 of them).
PS #1: nvm about those pots ... I burn that much for each 50-60% of my lvl.