LNG,
Although I do not sell firewood, I've been on the other side of the equation since 1979. I've been heating my home(s) primarily with wood for the past 28 years. I have run the gamut from buying tree-lengths to pre-split/pre-seasoned. And am now buying cut to length (18") green logs. (I split by hand during the winter prior to the season they will be burned)
Now, why am I telling you this? To give you an idea of the market. My present wood man (and all others in the past) have been in the business of tree removal or land clearing. They literally get paid top dollar to cut the trees down and remove them and then take the wood back to their lot and split, store, and sell. The fire wood end of the business is just gravy.
I got my unsplit, stove length, green wood for $150 a cord this year. I do not know what he sells split/seasoned for. But I do know that with the cost of his commercial splitter and the time it takes to split, stack, store, and deliver wood, he does not make his living off of fire wood. Remember, his supply of firewood is GRAVY. The wood itself is free - no, he is being PAID for it. The wood itself is part of his PROFIT.
If you could get unlimited tree lengths at a real low price, hire some real cheap labor (illegal ?) to cut and split, have some real estate to store at real low tax rate, have a good front end loader and fuel efficient dump truck, and CITY clientele who will pay 400 - 500 a cord (cut, split, seasoned, & stacked), then you could probably turn a profit.
Now, if you want to do this as a "hobby" to reduce the cost of your own personal firewood, then any splitter will do. You could have one of those trucks from VT deliver the tree-lengths. You could spend your weekends cutting the wood (sharpen the chain every hour or so, replace it every two-three cords). You could set aside 1/8 of an acre to store and season, and you could deliver about a 1/4 cord or so at a time in you pick-up.
Yah, it's a LOT of hard work. Think this endeavor through carefully. To make money from processing firewood, you need to be dedicated to it.