Despite the fact that you said you might not attempt this, I'd like to add for the general rule that when deciding to purchase a reptile, even for those who consider herping a hobby, the deciding factor is quality, not quantity.
I have had much better experiences with people who truly love herping versus those who are simply in it for the money. Baring, thats the same reason people go to breeders and not petshops. However, some breeders are doing the same thing as petshops do...just making more money.
So, now that I've hit the pessimistic side, If you decide to start breeding part or full time...I say go for it! What could be better than doing what you love...AND GETTING PAID FOR IT?!?!?
Just remember, each herp is individual and your turnover rate will be better if your customers are offered great genetics and great service. Happy Herping 