I'm guessing one reason that the Locals like part-timers is (at least in the non-Right to Work for Less States) because of the massive turnover, there are a lot of initiation fees coming in with all of the new members recycling each month.
As far as the dues goes, the 22.3s may pay more, but for every 22.3 employee, you could have two part-time employees paying dues along with the aforementioned initiation fees... No excuse for the Locals to not represent the 22.3s to the best of their abilities obviously.
When it comes to "Now we know.... that 22.3 people.... don't want to work" the only thing I can think of that he might be talking about is that many of our 22.3s will take less than 8 hours if given the choice, every day... On the other hand, here in Indy at least, combo employees are not allowed to work ANY over-time at all unless there is some sort of mini emergency. Part-timers of course are allowed to work nearly all they want to.
I believe this is being done in preparation for contract negotiations to show there isn't a need for additional 22.3s. In fact, since so many don't work their 8 hours, the company will try to use this to not replace the ones that are missing (of the 20,000+ total we should have contractually) and to likely propose to not replace any existing 22.3 jobs when they are lost through attrition during the next contract term...Just my 2 cents.