The problem is though, generally if the idea doesn't generate profit, then it won't really be considered and most suggestions i ever see are definitely not designed to make the company money. In that sense you'll probably have a lot of suggestions go through along the lines of let me search for specific items only in the trade center, Make the omega buildings generate tonnes of money. Make ONE HUNDRED new expansion zones.
If you have a look at their facebook page you see the same suggestions over and over and even in my opinion they're very far fetched.