Well, about 5 months ago I figured out a huge piece of advice for fellow traders.
This piece of advice many people are mad at me for when trying to make a fair deal, but trust me, in the end, it's worth it.
These piece of advice is: Trade by demand, not by rarity.
You may be confused, but let me explain.
Yes, make sure to do fair deals, but be conscience.
If you're a huge trader, and you are relying on trading this item for more, and keep trading and trading and trading, you need to have the right items that people want and will trade and overtrade for.
Before a trade, I always think about a few things..
Unless your for certain that you want this item with all your heart and you'll never ever ever EVER trade it, then be aware of a few things. You will want to have the right audience that will offer for your item, and will have a lot of demand.
For example, beards and top hats are two rare items. Beards are rarer then top hats, but more people want top hats. Mostly because of the cool coloring, the design, and shape of top hats people want them more. People consider beards ugly, small, and wierd. That's why I don't trade for beards, because they are hard to trade and not in the market. Also, another example.
You know the Purple worn blanket and the Blue worn blanket? Well, they are both one of a kind, the exact same rarity, just a different shade. Everyone knows that VisualEffects has the blue worn blanket, but not many know about Lemonfreeze12's purple worn blanket. Why?
Because people like the blue better, it's also a unisexual color, meaning both Boys and Girls like it.
It's also more of a mystery, and more people talk about it.
Now do you get it? Trade by demand, not by rarity.
Demand meaning how easy it is to trade, how many people want it, and etc.
Rarity meaning the actual count of the item, how many exist, and blah blah blah.
This also applies to den items and clothing items. There are many beta items in both categories, but people prefer to trade more for clothing rares, because then can show them off anywhere and look nice on the virtual animal that represents them self.
Hope this helps, see ya later!