i was thinking more about your situation and decided more convincing is order, so here it goes. like you, i had mid-tier status on a respectable airline last year and was reluctant to switch loyalties to an lcc with a (slightly) below average ff program, but the low fares and the flexibility enticed me.

the fact of that matter is that the majority of the time, hp is considerably than everyone else, including wn. other good points include:

-good terminal at dca; the metro practically goes to the gate
-fox sportsnet bars in phx and las are both very nice (except for the smoke)
-generally short (less than 1 hour) layovers
-lots of capacity ex-was --> many options
-tons of flights between pdx and phx; even when i end up booking the redeye (always cheap), i've been able to switch to something else and they seem to be pretty cool about letting me switch from bwi to dca when there's adequate space
-nice people on the whole
-decent ife