Some guys will go as far as claiming to always provide a little less in order to make her chase you.

The key phrase here is emotional investment.

In a lot of WAW cases the LBS is taken for granted because the WAW can't or won't invest themselves in the relationship.

In some cases they don't have to, the LBS does a lot of the heavy lifting.

If I remember right a study showed that partners who felt they worked hard for their relationship were less likely to leave.