Options and versatility=learn how to fly with trainers and simple aircraft, fly more advanced planes, edit planes to liking, goof off with stuff you edited (espescially with wespons), download tons off of swaps, edit those, and eventually get to my point where I was inspired to do CSs and finally, model. At least, that was my path.
And I think a good response to the original topic would be those clever signatures. I think one went 'It's a game...err...simulator!' Oh well. You're out there somewhere!