It takes you 6 hours to take care of your rats during the week? I check on them a couple times a day and refill water like, 3 times a week. Weekly cleaning takes me MAX 2 hours.. So at most I spend 3 hours with my rats per week. It is probably less than that.
Heh, I have a LOT of rats and mice! I breed not only for myself, but I sell extras to a friend of mine with 9 snakes, and whoever hits me up on Craigslist. I suppose some of that time is also spent deciding who to pair up next, as most of them are in a rotating system (instead of harem) for the health of the mothers.

I agree there comes a point when it IS worth the time and money spent breeding only for yourself. I suppose that number is different for everyone, but I'd think it's at least 10 snakes. Even if I had 7 snakes all the same size, it still wouldn't be worth it to breed my own if I wasn't selling extra.

the time consuming part happens when I have to dangle rats for 20+ snakes
I can understand the time factor of warming them up for a large number of snakes, but isn't the dangle time about the same amount of time it takes to supervise each feeding? One should never leave a live feeder and snake unattended until the rat is in coils and unable to bite.