Trading would be a bad idea. You wouldn't get the satisfaction of earning the building/decoration yourself and trading would be a way for people to make money from other people... I think a large part of the enjoyment in the game is earning the stuff and waiting for it to be built. :-)
I would never trade my Mapple Store or Cool Brown House. however, I would trade my frog prince and Claus Co for just about anything. The Frog Prince is gross and Claus Co. is big, ugly, and looks like a male organ.
Problem with your theory is that people tend to have all the limited items from when they started playing.
For example it is unlikely that two players would have (assuming items released in order 1-6)
A - 1,3,5
B - 2,4,6
allowing for a trade.
More realistically, it is
A - 1,2,3,4,5,6
B - 4,5,6
where a trade is useless for player A.
That would be way to easy to exploit. Whenever there is an option for trading of items or currency someone will find a way to destroy the economy.
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