I was never in it for the riches, I was in it for the ships. Which I would then get blown up flying with the Moustache Twirling Space Cads, and then do a bit more carebearing to get more ships. And though I will admit I might have spent a bit more imaginary space money pimping my mission ships than was entirely necessary, that was to make the time I spent grinding the missions shorter. (and also because I couldn't resist pimping my ships - everyone knows that fitting programs are more fun than actually playing the game)
In the end I stopped playing though, so now I am not rich at all. I do have probably a couple of billion in cash and assets scattered around though, if I ever reactivated the accounts. A decent chunk of that came from running faction war missions and selling faction frigates (which is carebearing where people shoot at you and you have to be all Das Boot) and doing pirate arcs and selling or keeping faction cruisers (which is carebearing where people shoot at you and trap you in bubbles, and you have to try to get from Empire to deep null in an AF, and then back to Empire again with a couple of hundred mill in blueprints in your hold).