People who are willing to put in the time and effort CAN make money in the bazaar. This requires someone to be able to haggle prices effectively, know what the market wants and their ability to get it.
I have known a few Tradeskillers in my time and being the first on a server to have 250 in a skill allows them to charge a small fee to do a combine with the good chance it'll combine. After all they spent thousands of plat and effort and time to get there, and it's usually a paltry fee.
The few exceptional
tradeskillers I know have had millions in plat. Currently one person is down to 700k (bought a Dark Cloak of the Sky MQ [rangers drool for 400k plat] and the other is at 3.1 million.
If you want to spend your time online buying/selling/trading then by all means have a blast.