I did it eons ago with a buddy of mine.
We used to load up a mason dump with sides and take it into NYC on a saturday morning. You would sell it by the bundle (5-10 pieces each). A cord of wood this way would get you about $450 or so and that was back in the early and mid 80's.
Two problems though. One, you needed to have an extra person riding shotgun with you to watch as you went into the apt. buildings to deliver. If not, you could come out and find people helping themselves to whatever they could carry away (this I found out the first time I went in alone). And two, there was always the doorman who had his hand out so you could use the freight elevator to make your deliveries.
Oh yea, a chainsaw does speed up your operation