It's in the numbers
WorldMark’s maintenance fees work like this (for 2006):
$121.91 base fee then add $94.52 for each 2500 additional credits:
For 5000 credits it’s $121.91 + 2 units of 2500 credits or 2 * $94.52 = $310.95.
This would remain the same until 7,500 credits then it’s:
$121.91 + 3*$94.52 = $405.47
As you can imagine you want to have an account in units, equally divisible by 2,500.
5,000 WM credits... $310.95
6,000 ... $405.57
7,500 ... $405.57
10,000 …$500
12,500
20,000….$878.07
40,000…$1,634.23
Etc
A 6,000 credit account will pay exactly the same as a 5,001 credit account or a 7,500 credit account. Buy in multiples of 2,500 credits from the 5,000 minimum account.
This is why it appears that WM is offering a “quantity discount” for larger accounts – but they are not.