38 signups sound huge. I wonder if a normal user would be able to reach similar stats when posting normal.
It sounds a lot but sign ups usually don't translate to actual money wagered unfortunately so you wont get anything unless they do. I had a couple of hundred on my PrimeDice account from posting my link elsewhere but only about 0.001 over a couple of months. I know some people who have had over 1btc in referrals though but that is very rare.