You got confused.
You wrote that DF subscription being $2.99. That's what lerocks was astonished about, and said that for him/her (obviously also a DF subscriber) it is 4.99. He/she wasn't referring to viki but about you paying only 2.99 in DF.
By the way.. I just visited DF and look what I found here:
For reference, the viki plans:
So as you see:
1. There are two different prices for Americans, just as in viki. And those prices are EXACTLY THE SAME.
2. For non-Americans, there is no Superstar Premium, just as in viki there is no vikipass plus.
3. The difference is that SOME non-Americans get a normal pass, but for less. Instead of 4.99, they pay 2.99
So the mystery is solved.
From this, it follows that 2,99 does not give you the equivalent of vikiplus (what they call superstar premium), because it's not available outside North America.