I've bred crested geckos briefly in the past (on a small scale), and even that took time and money than I had at the time.
I may one day decide to breed but it won't be to make money. It will be solely small scale, with high end animals, and I will make darn sure I have the proper set up, time, money, food, and capability of keeping all the babies until/if they sell.
NOTE: I doubt I will breed BPs. I have mucho respect for the folks that do - and can actually make some cash on it - but I think I'd rather branch out into a market a little less saturated. I've always considered boas as something that would be interesting and fun, and I like their morphs. I've also considered geckos again, cresties or even leos. They're fun little critters. IDK, we'll see.