There is no relationship between what you earn and your skill level. If there were, theoretical physics would be a top paying field. The reason is, this is capitalism and we are horrible negotiators. If you want to earn top money in a technical field, the best you can do is insert yourself in a revenue stream. Roles that are critical to revenue like a billing system or associated with a intrinsically valuable commodity e.g. petrochemical, are more lucrative than other similarly skilled professions.