I don't know how many there are but I do know one very vocal former Captain in LAX who was at a recent LEC meeting (and brought his wife!!) to complain about, and I quote, "I've paid 30 years of dues to ALPA, the least you can do is allow me to keep flying". I talked to him quite a bit - he was a former Tiger with a total of about 35 years flying in the 2 companies I believe - no children at home, no colleges to pay, plenty of money (his own words) who wanted to work as a Captain because "you just never know - it never hurts to have a little more money in the bank, because you just never know". Those are his words. I've been a bit tainted by that experience and wonder how many guys are just like him (yes he's riding the panel right now and will be back up front first chance he gets).