Why is speed an interesting topic to learn for miniature painters?

I want to thank this cool gang of students for their bravery to join up for speedpainting!

During this one day seminar I did explain my way of speedpainting boardgame miniatures that help me to paint a Zombie up for gaming in about 15 Minutes. 
Learn miniature painting on Roman Lappat's workshops!

Why is speed an interesting topic to learn?
Well, everyone knows how many models are there to paint. Some for gaming, others for display. It is just the best feeling to call something done and to learn a quick approach for gaming models is priceless. It saves you lifetime and time you can spent more on your display projects.