Do you spend a day flying around and gathering them all to one station? You could, but chances are someone will beat you to it, or at least part of them, dropping the buy price by the time you get Atlantica Gold all there.
What to do? Stock-pile, don’t sell them for less just gathers them. The market rises and falls with every order filled, remember, so they will go back up and you can still make the money you intended.
With the marketing skill you can login in a day or so, check the market, and if your number is met, just open assets and click sell. Assuming you are in range (level dependent) you never have to undock.
Strategy 2 Building on the above you can take it a step further. Pay people to haul those scattered assets for you! Set up courier missions (you must be in target station unfortunately) and pay those young Indy haulers just a bit of your profits to move your stuff for you.
You must be in good position cash wise, and be prepared to wait for your orders to arrive, but for those with a lot of cash and better things to do with their time, this is a viable option.