Cam,
I didn't sell a bow, or feel comfortable doing that, until I had been making bows for more than 3 years. Make a bunch, and give them away. That way, you can see how your work holds up, and if the bow breaks, no one has any hard feelings. That's what I did.
Also, I won't sell a bow to someone I don't know, or whom I believe won't care for it appropriately. I also won't make a bow for someone, for any price, if it's a bow I'm not comfortable making. Usually someone I sell a bow to has to endure extended conversations about wooden bows!
All that being said, I do offer a warranty on my bows, on a sliding scale. Full replacement for the first 6 months, 50% from 6 - 9 months, and 25% from 9 - 12 months (that's replacement cost, and buyer pays shipping). All that is contingent on following my care and feeding instructions provided with each bow I sell. Also, I provide NO warranty on bows >70# draw weight, and I am very upfront with anyone who wants a higher draw weight war bow. More importantly, this applies ONLY to the original owner.
However, I have replaced bows for people outside these guidelines. Of the hundred (or so) bows I've sold, I've only had to replace two, and one was not the original owner. I made a bow for him, he gave it to a friend, and his friend broke it by over drawing it. I made his friend a bow for the cost of the materials. Sometimes it pays to maintain your reputation, regardless the cost.