I guess I just can't get past the fact that you can easily make an unwise decision this way by overlooking practicality. You see a couple options you're not very interested in, and then one you are very interested in, and you pick it without hesitation?

I know i'd like to learn Tae-Kwon Do, but I also know my primary motivation for learning a martial art (beside the art itself) is to get in shape physically. From what I understand Muay Thai is a much better cardio workout. Tae-Kwon Do might be more fun but it wouldn't benefit me as much as the Muay Thai (not to mention kickboxing is probably more useful in a real fight).

So to reiterate my original statement: I think you can end up making the wrong decision if it's based purely upon excitement in an idea and not practical information which may be less exciting. I acknowledge your point that it may make your life more fun, but as i've learned growing up, doing things that aren't fun are often more important.