The way I see it; Flying is a Sport and Building is a Hobby

If you don't LIKE to build, or you live in an area where you can fly year-round, then there is no point in frustrating yourself with building.

On the other hand, if you ENJOY building and/or woodworking - especially if you live in a cold climate where you have several months of non-flying weather, then it give you something to do to keep from getting cabin fever.

Then there are people who enjoy building so much that they would rather build than fly, while others have no interest in building but really enjoy stamp collecting.

So it's really all up to the individual.