I'm 90+% 330B and was off from a few days prior to Christmas through a few days past the new year (had to bid a line to do it). Maybe more lucky than good, but I'll take it. Reserve coverage has generally allowed to me to freely move my reserve days or drop my entire schedule. Even in months I can't drop a particular trip, there is almost always someone willing to take it off the swap board. My schedule/control is not appreciably different that that of a guy who 70-75% in seat.
If you live in base...WB B. You may get to the WB and realize you'll never want to leave. You may miss the occasional event here and there, but you'll make more money while having more time off. I can't even see jumping to NB A until I'm super senior. The added workload associated with domestic flying just doesn't seem worth it for a relatively small bump in pay.