Too slow....
Not only do you have to trade from one station to another but you have to hunt around for the best prices to make sure your not ripped off. I bought a whole cargo full of items and i wasn't sure of the cheapest deal but i thought it was fair enough, but when i was flying around trying to make a profit it was too annoying becuase you have to check everywhere to sell for more money. this gave me stress because of the lack of research of what's a good price or not, even when you think you've got a good deal. which means you have to compare every station for stock prices before you fly around from one sector to another just to make a small profit of one load.
also the asking price for new ships are over the top, i've spend a good ten hours before making around 30000, but to get something decent i have to spend 300000, which is an enormous amount of trading time.
i don't think i could dedicate my life to this game when i have so many other games worth playing.