Hypothetically,
Home built enclosure banks (approx $250 for materials to make 3x 4x2x2 enclosures) thats what it cost me it cost me $500.- each and I made them myself. I have 11 of them plus hatchling facility.
Microclimate B1 thermostat to run all 3 ($180) what I paid Oil heater to heat up the gravid female's room $350.-
3x heat panels (approx $500) I actually paid $110ea
Branches & substrate (a very generous $1000) seriously bahaha The time spent cutting them / fuel? Ahhh, we do that for love, I forgot - cancel that one.
Fodder for the year (a generous $500 for rodent food and bedding to breed your own) about right for a larger collection More like 3K / year in my case.
Incubator (free fridge, $180 for a dimming stat & approx $100 in containers & heating) true I did this All up 2K (4 incubators).
Electricity (a very generous $350 a quarter) this would be right for more then just a pair lol You have got to be joking. N/a in my case.
Snakes (lets just say hypothetically GTP at $1500ea) hehe Hehehe, how wrong can you be? Would you start serious breeding program with $1500.- GTPs?
Average clutch of 20 eggs. = 30k from 1 pair. No, the average is not 20 eggs. If you have young females, they produce 12 - 17 eggs in their first litters.
Another thing is - you don't always sale everything you produce. If you had 3 females producing 20 eggs each, do you think you would sell them all in one year?
Investment + yearly costs = $7110
Profit = $22,890
If you like you can double the costs above and there is still profit to make.
Now add all the other snakes in the collection & you get the gist of it. And only a short 3 years ago GTP were still selling for 5k ea (100k + a clutch)
That is 20k profit from just 1 female. Now tell me you can't possibly make money from breeding as a hobbyist. Not everyone is, but some deffinately are. I know because I do although it goes back in + into other hobbies.