[ldiracdelta]

Purely a guess, but I think that spaces vs tabs is a proxy indicator of some psychological difference. Perhaps it is conscientiousness. On some editors, you have to go out of your way to change tabs to spaces. If you're very picky about how your code looks and want it to always look the same in every editor and to everyone, then maybe you use spaces. Personally, I do ascii diagrams and even arrows inside of comments to point to different variables and make comments on active code. I am very very picky about how my code looks. I know code aesthetics isn't a be all end all, but maybe it could be some psychological tendency like this. Also, I'm not a paragon of big bucks or awesome, revolutionary code. Over time, perhaps conscientiousness or fastidiousness keeps you employed or people give you more responsibility and money.