As far as I understand it, 0.0% is the internal value for variable interest...
Also they seem to charge 5% of interest, not 2% on capital for lenders.
Your right, it used to be on the entire balance when the site was starting out, but that wasn't fair and was removed, now they get 5% on the interest earned.
Also VIR changes during the duration of the loan, I have a lot of money loaned out with VIR and the rate is always in constant flux, one day its 10% the next its 20% (for BTC, with USD the swings are around 40%-300%)