I personally don't mind that Tripwire is trying to, you know, make money; it's how companies stay afloat (*gasp*, you mean positive energy isn't all you need in life? Shocking, I know).
I hope Tripwire comes up with more cool free paid content, as long as the top tier stuff is still balanced to where I don't have to necessarily buy it right away to still win with my favorite strats.
I really hope the beta drops Tuesday. Also, I haven't seen this question answered yet, although asked quite a bit: will our current exp carry over into the beta? I would hope so or I will be sad