Still Ab,
Yes you need to get a type rating to work for Southwest, but they are, in fact, amongst the best paid 737 pilots in the world.
Everywhere but Australia and New Zealand it seems, part of the low cost model is paying pilots well to ensure supply, commitment and retention.
I make more than a BA captain flying the same aircraft on the same routes.
VB, Freedom and Jet-connect are getting away with third world wages for the moment (addmitedly,
VB are improving), but they will have trouble in the future when their people get the sort of experience valued (and paid for) elsewhere in the world.