Unfortunately people here are not preferring trading themselves. Most of forum members are preferring buying/selling with exchanges. One probable reason could be, practical problems like delay in finding buyer/seller and need of escrow. Still, if you check on altcoin marketplace there you can find lots of people are dealing for different coins.

Honestly, I always like emphasizing to deal in decentralized way. We must open a topic here and need to announce like want to buy/sell one coin for this price like that. So, that people will deal as per their wish without the fear of getting struck into scammy exchanges.