I have to agree with the above. Pay and benefits are king when you are working.
There is one large and very popular Philly TV station that AFTRA has never been able to unionize. Why? There is no additional benefit for those folks with a union shop. Their pay and benefits are top notch, ever since Walter Annenburg's Triangle Publications owned the staion in the 1950's.
There is a place for every kind of shop. For example, you could not unionize my current shop. The retail third party service broker situation could not suport a union cost structure.
Sure, I would like the pay, the benefits, and the additional training I would get, but so far, that has not happened.