Mojave X Lesser is reported to produce the most white of the BELS, while lesser X lesser and mojave X mojave have some color discoloration at times. Sometimes moderate, sometimes extreme. Beautiful animal, however.
EDIT: Also, as he ages the color should bronze out or turn a platinum color because he is from Lesser X Lesser.
Mojaves x Mojaves have more purple effects if there are any discolorations and also bronze out with age, but not to the same extent.
I should say the markings definitely do not make your animal any less marketable than a pure white BEL, because a lot of individuals love the discoloration. Some people of course prefer white, but others definitely love a little mark to their pythons.
Hope that helped.