Well I for one haven't had anyone wanting to trade yet, but I like it being "on the low" especially if a cat has material that is 1.rare 2.unique/modifed even 3.original, from his own private stash of vinyl 4.shyt he's actually drummed out and recorded himself (is most likely the most rare and treasured find/trade you can get) ....those are some suggestions why trading is great. As much as I love sharing, there are just some breaks that shouldn't be shared among the masses, and if you can't understand that logic than you need to re-think your knowledge of Hip Hop.
edit: that wasn't directed personally to you Gonzo it was just me stretching my knowledge