I am all for people signing up as long as they know the deal. Referrals are cool as long as people know it gives the the person credits towards their account, which I am sure some people do know know.
Also I do not know the rules on these forums about referral links, but most forums will actually ban you for posting them, even more so since we are currently able to sign up for free.
No harm intended, just trying to spread the word and keep people aware.
I personally signed up without a referral and was invited within an hour, maybe I just had good luck.