Thank you all for your comments, except for the person with the very scary mouth icon picture.

Let me try this a different way. Imagine a player selects "best gunfighter in the west," and selects a poor gunfighting skill. So, they can spend a fate point to shoot (slightly) better, and I can compell them by having them take all challengers. However, coming from outside FATE, this sounds silly - he/she isn't the "best gunfighter in the west." I'm a fan of the idea that constraints encourage creativity, but since aspects like this can be completely fake or overly broad, you can get people doing silly things with them just to get their 2+ bonus.

Your example basically summed up the movie "Rango".