Paying your dues is working a flying job with less-than-ideal wages in a less-than-ideal location and with less-than-ideal job conditions.
Night freight in broken-down pistons with minimal IFR equipment is paying your dues. Starving as a CFI with an occasional charter gig is paying your dues. Missionary flying in the back-end of the Third World is paying your dues. Having Uncle Sam tell you where to be--tomorrow--how long you'll be there and not being able to say a thing about it is paying your dues.
Paying your dues is not undermining the whole profession by taking what should be a paying job and doing it for free.
I agree with this guy. Giving your time away for free when someone can be paid for the work your doing is not paying your dues. It's giving the said employer the idea that people are willing to work for free. What do you think the new norm has become for this employer?