Gnomish infravision

Sorry for bringing this one back again but I've been reading through it as I work on a couple of new custom races for an upcoming game. 

#7 in Alex's explanatory post is confusing to me (even after the discussion above).

If the race’s racial value does not mimic a class (such as dwarf), divide the Racial Value XP cost at Value 4 by the cost for dwarf 4 (1,400) and multiply the result by 10,000 for 2 class types and 30,000 for 2 class types. This is the additional cost per level after 8.

What is the difference between "...10,000 for 2 class types" and "...30,000 for 2 class types?"

Those seem to be saying the same thing but have different values attached. I'm sure I'm just missing something but I'm not sure what. What is the standard for determing if you use the divide by 10,000 or divide by 30,000?