Every player is able to see the trades of the 200 closest players; the amount of shown trades in the trader doesn't depend on the amount of discovered cities. However, discovering a city does help to get rid of the trader fee. Because you would always see the 200 closest players in the trader, no matter how many cities you have discovered, you would mostly see the same player names. The names would only change if a new player replaces an inactive one in your neighbourhood.I discovered more than 100 cities. Where are the offers?
Who select what kind of offer is displayed in the trader - are there no other offers?
I can see mostly the same players in the trader.