Trade of any kind is really horrible in my opinion and I never thought of this before I actually played Classic and went through 2-3 Christmas, Easter egg event.

Yes, you are right it involves the whole community to participate and do something that would be helpful to each other. However, negative side of this or the reality is, most people abuse this whole trading-alike systems. Such as scamming as many of you mentioned, but I also see fake friends just come to me beg for gift/eggs. I mean it's ridiculous and even myself, when it comes around the Christmas I expected some gifts from my friends cause they can gift me. If there's no option for trading/gifting, this game won't get corrupted.

I totally agree what Rufus said up there, Classic had done fine for five years without it. Just look at other games like Runescape that's been out for 10 years. Their economy is so messed up right now. Armors are extremely cheap, consumable items/rare items are outrageously high in price. If Classic allows trading, Classic will be like Runescape. Classic has a lot of rare hats.