If you get new weapon skills...

[Miriel]

Isn't one of the biggest arguments that people make when others complain about the monthly cost is that those monthly payments help pay for new content?

I don't think it's unreasonable to want SE to keep additional costs for new content relatively low or provide good bang for your buck given how much players have already invested in the game (hundreds of dollars most likely). Square is concerned with their bottom line, users should be concerned with theirs as well.