Nearly finished projects

Why is it that the fun part of a project is the brainstorming and finding the right materials and details and then actually executing things to completion is not that much fun at all? I have so many nearly finished projects that were so fun until they hit that point.

Here's a perfect example:

Desk BEFORE, originally uploaded by Cynthia in SF.

I've had the paint for this desk for a MONTH. It's Benjamin Moore AF-525 Fiji: