For me it's a balance of cost, time, and almost an ethical consideration. I see breeding as the pinnacle of successful captive husbandry, so a successful brood would let me know that I'm taking care of my animals right. But there also is (or should be) more to deciding to breed than just "can I do it?" I probably could have thrown two of our cresties together this year and produced viable eggs, but where would I keep the babies? Could I afford to set up enclosures for all of them? If I produce random low-quality offspring with unknown genetics, how am I going to find them quality homes? Can I afford to keep all of the potential babies if I can't successfully find them homes? With over-saturated critters like BPs and crested geckos I think there needs to be a further consideration than just can it be done. The market is already over-saturated with normal-type animals. Does an amateur hobbyist/novice breeder really need to add more?
So I may try my hand at breeding in the future, but I only want to do it when I can make a positive contribution to the hobby. I don't want to throw middling-quality animals into a saturated market just because I can.