If you have a small collection it's not worth breeding them.
If you have a large collection~ well then it depends on how you value your time.
I run 10 tubs of mice, and 19 tubs of rats. My monetary costs weekly look something like this:
Feed: 50lbs per week at $15
Shavings: 1/2 bale per week at $4.50 (the whole bale is $9, but I only use half a bale a week).
Pelleted bedding: 40lbs per week at $5
So my reccuring monetary costs are approx $25 a week.
I feed out about 20 to 30 mice a week to the corns ~ they would eat F/T so I can value them at about $0.50 each so there is $10-15 there.
I feed out about 20 to 30 live rats a week to the BPs (they will not eat F/T so must value these higher. I can purchase dirty, nasty rats for $1 each, or nice clean live rats for 2.50 each) so on the cheap side I could feed the BPs for $20-30 a week, but I wouldn't, I would have to pay the higher $50-75 a week to feed those.
I feed the monitor about 14 mice or pinky rats a week. He will take F/T so we can value those at $0.50 a week. Thats another $7.
So, bare minimum I would have to pay approx $37 a week to feed, but that is to feed the minimum amounts of the cheap dirty rats to everyone, I would actually pay more like $97 a week to feed everyone. These numbers do not even count what I would pay to feed the neonates in the summer. I'm expecting about 100 hatchlings this year, at a pinky or two a week.
so I am saving a considerable amount of money weekly, and I am feeding strong healthy feeders I KNOW are clean. I make a little money back too~ not much~ I don't sell my extras for much. Mostly I trade them for even more snakes I have to feed!! LOL!
So monetarily on a cost per week basis~ It's a no brainer. Now the down side.
I spend approx 3-4 hours on every cleaning day. I would like to clean once a week, but the smell gets too bad~ so I clean more like every 4-5 days. (increase the litter cost some due to my cleaning more often, didn't think of that above).
I spend approx 30-40 min every day checking tubs, water spigots, and feed hoppers~ pulling pups, freezing and sealing when needed.
The tubs are kept in 5 racks, the racks cost me approx $100 each to build (at different times in the last several years) and at least two 8 hour days each. (MUCH longer for the first one while I figured it out!) They still look good, but I am only expecting about a 5 year life out of them.
There are 5 auto water systems, about $50 each. Again, a one time cost, but I plan to buy more valves soon to replace some that are 2 years old and getting slow.
The CO2 set up, and the vaccum sealer~ about $150 initial purchase~ recurring cost of about $32 every three months (CO2 fill is $2, bags for the sealer are about $30 for a big box)
I have an entire room (outside dedicated to them)~ so the cost of having the extra room.
Electricity to keep them cool in the summer. I have no idea how much of the monthly electric bill is theirs~ but electricity is HIGH in California, and it gets HOT in the summer~ so I Have to cool them.
Time, money and frustration trying to figure out:
How to cut the smell
Why that water spigot stopped working
Why did that rat die?
What happened to the fourth rat in this tub~ and whats this tuft of hair from?
How do I stuff 50-60lbs of rat litter in the household garbage every week?
What will the neighbors do if they realize I have an entire room FULL of rats?
But this one is too cute~ I can't feed it out!
Why is that one sneezing? Myco?? Litter issue?
Hair loss?!? Rat mites?? Too much protien??
The list goes on~ and on~ and on.
So~ like I said WAY up there~
If you have a small collection it's not worth breeding them.
If you have a large collection~ well then it depends on how you value your time.