Everyone hopes to have a hobby paying for itself, been there done, I am even one of those making a profit, the difference is that YOUR plan is UNREALISTIC
What you are failing to understand is that based on your first postit's just not gonna happen.I have about $180 to spend on the snakes.
You need to feed 2 snakes for 2 or maybe 3 years, you will need to buy or build an hatchling rack, an incubator, you will need to feed 6 to 12 extra mouths for an undetermined amount of time (until the hatchling sell whether it is retail or wholesale).
Now here is the reality of the market, normal and single gene animals are hard to move the market is flooded as it is now, and by the time your animals will be ready to breed and produce a clutch the price of said animals will have dropped even more and they will still be as hard to move. Even if you are lucky enough to produce a 2 genes animal you will not see a return.
Again by the time you produce something (based on the initial investment) you will have already spend more then what the clutch is worth, that means you will not make a profit, you will not break even you will be in the red (been there done that too for 2 years when I first started and I initially invest 10K)