Joomla Designs for Designers and Wood for the Carpenters

Do what you do best is my motto. If you are a carpenter - stick to the wood, of you are a web-designer stick to Joomla Design or Flash Design. If you do, what you can do best, then you will get much more effect from it, and it will very often cover the expenses of buying other services from somebody else. Lets say I am a musician. How do you think, what will bring me more profit and satisfaction: playing on my favorite instrument or making and selling lets say Joomla Designs? I think the answer is pretty obvious.