So in summary:
20% of your investment went into capitalising the asset you now hold
80% of your investment went into capitalising a private company in which you didn't get any shares
Like I say, that's just my understanding of the current equity balance of the ICO. I'm happy to be corrected if wrong.
I think the 20/80 rules only apply to the last 147K ETH that poured into the ICO that was above their intended 250K ETH cap. So I think the correct way to look at it is that (250+0.2*147)/397 = 70% of your donation went into capitalizing an asset you now hold. The remaining 30% went to an unplanned, "ex post facto" fund whose assets you now have no claim over. For the next 2 years this new fund will purchase tokens (at a price that gives zero profit to the public sellers) and give those tokens back to the Bancor Network that issued them.
Bancor blog clearly states that 20% of raised ETH goes into reserve, which is ~80K. They crowd sold only 50% of BNT (~40M), the other 40M they gave to themselves. In the end, 80M of BNT is backed by 80K of ETH. At a price of 100 BNT per 1 ETH this means 10% reserve ratio.
People, at lest learn times table before you invest into something.