Its not about getting rich, its more about how the market in the towns is generally stale, over priced, lacking competition and being used as personal vaults, everything a market shouldnt be. The trade forums are useful but they require alot of inconvenience to be really useful, things such as having to create an alt so that your homestead remains safe, having to be online at the same time as the customer which leads to situations where your fulfilling an order only to find out the customer has found what they need earlier.
Market stalls are a great edition to the game, but as they currently stand they are lacking, alot.