It doesn't quite work that way...
BELs often times aren't even produced from a cross clutch. Like Het. Albino x Het. Albino you only have a 25% chance PER egg that it will be an Albino. Its the same with BELs.
It is completely possible to have 20 snakes, and none of them turn out to be BELs.. thats the chance of genetics.
Also, mass producing BELs would be very difficult and drown the market even more, so it's a bad idea.
Also, certain combos make better looking BELs than others. Of course, those are more expensive. Mojaves are probably the least cleanest looking BEL out there.
My favorite is the Fire's Black Eyed Lucy. However, I'm not willing to pay 12 hundred for a Fire, when I don't even like Fires that much..
If you purchased a Mojave, (lets say it was male) and bred it to a normal about 1-2 years later, you might get a female mojave to breed with it.. which it's a 50% chance per egg for both female and mojave.
Then you wait 2-3 more years to grow up the female, and breed her to the male.
You could get a BEL, or you could not.
And if you miss the first time, it's another 1-2 years before breeding again, depending on the female.
It takes 5-7 years to get these babies from a single gene. :]