Totally Related Art Segment
Programmers are valuable to games development. It is just that without a good artist, that programmers would be reduced to ASCII. Artists have the same problem, without a programmer, we can't do anything except for card games. I mean, it isn't like these two professions are mutually exculsive
. It is just that when they are combined they make a really good product.
To answer the question, if you want good art, you either have to find it or find someone who can do it for you. Lessons can only get you so far, and the time spent learning to draw will push development time forward light years. For simple pixel art you may get away with it, but anything more than that just bite the bullet and pay for that art(ist).