Im not sure when geckos came about I want to say they were after 2006 though, but technically thered be a lot of things you could make a bundle off of when it first came out in game knowing what I know now.
Honestly in some ways I wouldnt want to now either, as much fun as it is being rich, I dont think being insanely rich would mean much more and might make the game entirely unfun for me. I know that over the years playing I have purposefully not engaged in some things knowing theyd be extreme isk makers simply for that reason. It would spoil the joy of the game for me being too rich.