^^ +1 for Andy's advice!

And wheel building, unlike some things in life, isn't a "necessity" for the customer. The customer will want not only top work but also the best price. And there will ALWAYS be some new kid on the block with a "Wheel Building For Dummies" book and a truing stand who is willing to undercut the price to get started. Since he's working in his parents' basement, he has no overhead and can work really cheaply.

So to summarize: It's already a crowded market. There are already many well-known builders. The overhead to enter the market is minimal. The competition is tough.

Is this something one REALLY wants to do, or are there better ways to go? Knowing how tough it is to earn a living in the bike world, I generously tip the bike shop kids when they do service for me. But I can tell you that I'm in the SMALL minority...