i think there a serval reasons, why u dont see them so often.
1st- its a long time project with 1 in 16 odds.
2nd- cause of that it cost 20k or so (dont know the right price, cause i didnt see them for sale the last year...)
3rd- they get yellowish with ages (some lines less, some lines more)
4th- u can get pure white snakes with blue or black eyes for a bit over 1k- and these are pure white and stay pure white (at least the most BELs- super mojos are different)