I do stuff like this myself for fun, and to save some money. I enjoy doing it, whereas I dont enjoy working extra hours to finance my hobbies. It is also a real learning experience.
I have seen quite some discussions on finding an extra job vs. building things yourself. If one puts a price on off work hours, there is not much worth doing yourself. I refuse to think that way, working to earn money is well and good but building things yourself is also a rewarding experience. Not to mention that the parts you do yourself can be customized and of higher quality as you get better at it.

There is also a family side to this homebuildt vs. work extra hours. If you do it yourself, you can do it at home and be available for your family, or even involve your family in it. I attached a picture where our youngest daughter is 'helping' me assemble a new jib <img src="http://www.catsailor.com/forums/images/graemlins/smile.gif" alt="" /> (wife made a veto on spi-work in the living room after we buildt a new Tornado spi there. Too noisy and too much cloth).